This guide was written based on the unedited version of the game. However, since then I recieved a blessing from the dev to publish my bugfixing mod that you can find HERE. Every bug mentioned in the Map Compendium was fixed by me in that Bugfixing Mod. A LOT of bugs. I highly recommend installing it.
Nevermind, bugfixes are now merged into the base game.

No map needed for town sections. Though, curiously, it seems that the first draft of the game's introduction was in the form of the actual walkable level that you can still see in game files. Also, at some point the game allowed you to choose between two difficulties, the easier of which enabled some sort of minimap for easier exploration.

Unmissable achievement - "Entered the Tower"

I'll be using the in-game names for floors. Don't come asking me why Floor 04 is missing and other such questions.

Click maps if you want bigger images.

To see all the endings most efficiently, you will need to create two saves. I will clearly state when to make them.

S - start
1 - Katt; gives you "Socks"
2 - Evan
3 - Evan; gives 15 Potions on first interaction, then sells Potions (6 dust) and Hi-Potions (25 dust)
4 - Evan; battle
5 - Hob; battle
6 - Hob; battle
7 - Old TV
8 - Evan; battle
9 - Old TV; (you MUST interact with this one first) 100 dust, 4 MP Juice
10 - Elppa; Skill trainer; answer "I agree" to get "Toxic" skill
11 - Evan; battle
12 - Hob; battle
13 - Old TV; (when you open this one, Old TV at map marker 9 becomes unopenable) 4 Potions
14 - Evan; battle; can be skipped if you answer "Cute name", and then "No"
15 - Crow; no interactions for now, but at later point you will get the item that will translate their CAWs for you
16 - Hidden TV; plays a sound if you interact with it 4 times; no idea how to reach it, and the sound is nowhere to be found in the game files, so this must be a case of cut content
17 - Exit to Floor 02

S - start
1 - Evan; battle
2 - Hob; Skill trainer; let him drain you (-8 HP) to learn "Sap" skill
3 - Twins
4 - Uzob Oruk; Skill trainer; answer "Yes" to learn "Zap" skill
5 - Ibukorukor; sells Potions (7 dust), Hi-Potions (25 dust), MP Juice (10 dust), Antidote (15 dust); if you answer "No" battle starts and merchant won't be available anymore
6 - Katt
7 - Old TV; shows short video
8 - Melpomene appears;

Unmissable achievement - "An Introduction to Muse"

9 - Evan; battle; can be skipped if you answer "Give up"
10 - Mel
11 - Hob
12 - Hob; battle
13 - Mel
14 - Exit to Floor 03; answer "A river" to get 5 exp

S - start
1 - Old TV
2 - Elppa; battle
3 - Portal to FloorSchool; two-way
4 - Mel
5 - Portal to FloorBonus; two-way
6 - Evan
7 - Elppa; battle
8 - Goblin
9 - Onibi; Skill trainer; answer "Yes" to learn "Toast" skill
10 - Rooster and Hob; battle
11 - Exit to Floor 05

1 - Portal back to Floor 03
2 - Desk
3 - Lex
4 - Lectern

S - start
1 - Crow
2 - Hob
3 - Portal back to Floor 03
4 - Exit to FloorBranch 1; enter only after exploring all of Floor 03

s - start
1 - Onibi; same Skill trainer from Floor 03 who teaches you "Toast" skill
2 - Crow
3 - Brock Lee; optional battle, if you answer "Samsara"
4 - Crow
5 - Exit to FloorBranch 2
6 - NEW EVENT - Sickly Woman

1 - start; doesn't let you go back
2 - Old TV; shows short video
3 - Black figure; starts the "Devas quest"
4 - Crow
5 - Crow
6 - Mel
7 - Portal to Floor 05

s - start
1 - Mel
2 - Ibukorukor; sells various potions
3 - Crow
4 - Onibi; answer "Yes" to trigger optional battle in the south-western corner of the floor
5 - Portal to FloorOcean; two-way (but return path does not involve entering the portal)
6 - Elppa; battle
7 - Old TV; 4 Potions
8 - Elppa; talk event on first interaction, and then battle on second interaction
9 - Flute; talk event normally, and battle if you answered "Yes" to Onibi at map marker 5
10 - Elppa; battle
11 - Elppa; battle
12 - Elppa; battle
13 - Mel
14 - Purple Hob; Skill trainer; answer "Winter" to learn "Frost" skill
15 - Old TV; 1 PBJ
16 - Old TV; 4 Potions
17 - Elppa; battle; can be skipped by answering "What is it?" or "Is it bean related?" then "Love em"
18 - Crow
19 - Hob
20 - Uzob Oruk; can recover your HP and MP, but only once
21 - Bevan; Skill trainer; answer "Girl?" or "I could sweep you" and defeat him in battle to learn "Gust" skill
22 - Mel; answer "Do you like your job?" to trigger an additional dialogue much later
23 - Rooster and Hob; battle; can be skipped if you have PBJ item
24 - Exit to Floor 06

s - Start
1 - Fish
2 - Fish
3 - Fish; fishlord quest, answer "Yes" to accept; returns you to Floor 05 after talking

s - start
1 - Katt; battle
2 - Crow
3 - Satyr; answer "Skin Hunger" and then "If I say ouch" to earn 20 exp
4 - Old TV; 1 MP Juice XL
5 - Katt; battle
6 - Mel; talk event that triggers after interacting with portal at map marker 8
7 - Katt; battle; can be skipped if you answer "Okay" or "Why?", check the portal, return and answer "I saw a strange blue man"
8 - Portal; answer "A golden flower" to get exp and trigger additional lines from Mel at map marker 6
9 - Old TV; 4 Potions
10 - Katt; battle
11 - Crow
12 - Uzob Oruk
13 - Hob
14 - Ibukorukor; sells various potions if you answer "I'm scared of dying"
15 - Old TV; 4 Potions
16 - Portal to FloorHospital; two-way (but return path is from the connected FloorNurse); will disappear after one use
17 - Mel
18 - Katt; battle
19 - Exit to Floor 07

s - start
1 - Ghost
2 - Ghost
3 - Chii; exhaust his dialogue (talk 3-4 times)
4 - Door to the altar room; the altar does nothing during this visit
5 - Ghost
6 - Mel
7 - Ghost
8 - Ghost
9 - Rat
10 - Ghost; teleports you to FloorNurse

1 - Ghost; talk event; can end in battle; to prevent that outcome don't answer "This is hopeless"; to earn exp, answer "Yes" when ghost asks you to be his friend
2 - Old TV
3 - Portal to Floor 06

s - start
1 - Elppa; battle
2 - Old TV; 17 dust
3 - Flute; Skill trainer; answer "I'm fairly quick" to learn "Double Attack" and "Slow Move" skills
4 - Elppa; battle
5 - Ibukorukor; sells various potions if you answer "I'm scared of dying"
6 - Old TV; shows short video
7 - Portal to FloorPrison; two-way; disappears after one use
8 - Old TV; 1 PBJ
9 - Beetroot
10 - Special Crow; triggers Mel scene
11 - Rat; Bugged Skill trainer; teaches "Fright" skill
12 - Old TV; 2 MP Juice
13 - Exit to Floor 08
14 - NEW EVENT - Bug
15 - NEW EVENT - Froggy

s - start
1 - Mel
2 - Duck
3 - Reeeee; answer "Yes" to get "Sweet corn" needed for fishlord quest
4 - Bed; 5 MP Juice
5 - Lex
6 - Portal to Floor 07

s - start
1 - Old TV; 4 MP Juice
2 - Crow
3 - Elppa; battle
4 - Onibi; answer "Yes" and then "Everyone climbs the tower" to get Key1
5 - Cubes
6 - Mermaid
7 - Mel
8 - Twins
9 - Exit to Floor 09; requires "Key1"

s - start
1 - Statue
2 - Crow
3 - Onibi
4 - Katt
5 - Mel
6 - Evan; Skill trainer; teaches "Enhance Spell"
7 - Duck
8 - Hob
9 - Mel; triggers only if you talked to Chii on FloorHospital
10 - Exit to Floor 10
11 - NEW EVENT - Clown

s -start
1 - Katt; battle
2 - Black figure; Skill trainer; teaches "Scare"
3 - Katt; battle
4 - Katt; battle
5 - Mel
6 - Crow
7 - Old TV; shows short video
8 - Ibukorukor; sells various potions; if you answer "No" battle starts and merchant won't be available anymore
9 - Hob; gives "Key2" item
10 - Onibi
11 - Goblin; can recover your HP and MP, but only once
12 - Hob

Make a savefile just before exiting this floor. It can be used later to unlock the Bad Ending, if you want.

13 - Exit to Floor 11; requires "Key2"
14 - NEW EVENT - Honker

s - start; Mel heals you, then you can answer "Thank you" to please her or "Yeah, yeah" if you want to work towards the 4th, Bad Ending (Mel has a chance to get "upset points" at various moments; this is one of them); be aware that there are no achievements awarded for this ending specifically
1 - Crow
2 - Crow
3 - Ryan; boss battle

Unmissable achievement - "Defeated Ryan"

s - start
1 - Onibi; battle
2 - Skeleton; Skill trainer; teaches "Divine Breath"
3 - Mel
4 - Crow
5 - Portal to FloorJapaneseTown; two-way
6 - Ghost
7 - Axolotl; different dialogue if you started Devas quest - say "I want to meet a Devas" and he will teleport you to FloorBranch 4 (only one chance for that), then he will bring you back
8 - Old TV; shows short video
9 - Crow
10 - Exit to Floor 12; answer "None of these" to get 15 exp
11 - NEW EVENT - Gomi

s - start
1 - Mel
2 - Katt
3 - Devil; answer "I'm seeking power" to get the absolutely useless "Demon sticker" item
4 - Axolotl; teleports you back

s - start
1 - Mel
2 - Buddha; can give Sweet Corn to him, which will fail the fishlord quest and you will lose a chance to unlock an achievement; gives 5 Malt Liqour in exchange
3 - Portal back to Floor 11real
4 - Grab Menthol cigarette from here
5 - Portal to FloorBonezone

s - start; can talk to all the skeletons on the floor
1 - Skeleton; gives 2 MP juice XL
2 - Lex; DO NOT give him Menthol cigarette, we'll need it for achievement
3 - Portal back to FloorJapaneseTown

s - start, and also Layne npc; answer "I'm in"
1 - Mel
2 - Scrimith; say "Sup, dork" but only once if you don't want to fight him and upset Mel (moving the game towards Bad Ending); so INSTEAD, you should say that Layne sent you and then go back to starting point and fight Layne; return to Scrimith to learn a secret
3 - False wall and Mel interaction
4 - Ibukorukor; sells various potions; if you answer "No" battle starts and merchant won't be available anymore
5 - An interesting interaction with Twins
6 - Old TV; shows short video
7 - Hob
8 - Exit to Floor 13
9 - NEW EVENT - Chelare

the gimmick on this empty floor is a chaser enemy

s - start
1 - Crow; nothing unusual aboit it
2 - Exit to Floor 14

s - start
1 - Portal to FloorOcean2; only available if you started fishlord quest and have Sweet Corn in your inventory
2 - Katt
3 - Chrunobog; Skill trainer; answer "Why don't you show me?" and then "Yes" to learn "Wraith" skill
4 - Fly; battle
5 - Crow
6 - Onibi; battle
7 - Duck
8 - Beets; battle
9 - Statue; only available if you got "Devil sticker" from FloorBranch 4
10 - Old TV; shows short video
11 - Flute; battle
12 - Mel
13 - Goblin; Skill trainer; teaches "Bubbles" skill
14 - Ibukorukor; sells Armor items and usual potions
15 - Onibi; battle
16 - Exit to Floor 15

Same as during the first visit. Map marker 3 teleports you to Fishlord again. Give him Sweet Corn to finish the quest, unlock an achievement, gain 2 levels and new weapon - Heathers Trident.

Achievement - "The Lord of the sea"

s - start
1 - Ebakiron; battle
2 - Crow
3 - Hob; answer "My alarm" and then "A dream" to gain 20 exp
4 - Mel; triggers only if you talked to ghost on FloorNurse
5 - Ibukorukor; sells Armor items and usual potions; there are two identical merchants on this floor for some reason
6 - Uzob Oruk; battle
7 - Old TV; 1 Malt Liqour
8 - Crow
9 - Umasu; seems to be a part of cut content
10 - Monkey
11 - Caf; answer "Teach me what you know"; win the battle to access his shop: Hi-potion (10 dust), Malt Liquor (20 dust), Goof Suit (300 dust)
12 - Mel

Unmissable achievement - "Caf"

13 - If you kept the Menthol cigarette, Caf will appear and ask it from you; refusing his offer instakills you, otherwise you get "Deen Chowder" item and an achievement a bit later
14 - Satyr
15 - Crow
16 - Uzob Oruk; battle
17 - Mel; answer "I don't have time" if you want to upset her (and move closer to Bad Ending); otherwise, say "What is on your mind Mel?"; this is also an event where the talk about Mel's job continues if you asked her before; when she asks "Does this make you think of me differently?", answer "Yes" if you want to upset her (and move closer to Bad Ending) or "No" to gain some happy Mel points instead
18 - Fly; battle
19 - Exit to Floor 16
20 - NEW EVENT - Crescent King

s - start
1 - Brock Lee; battle
2 - Door to FloorBranch 3; two-ways
3 - Uzob Oruk
4 - Satyr
5 - Ibukorukor; sells various potions; if you answer "No" battle starts and merchant won't be available anymore
6 - Crow
7 - Uzob Oruk
8 - Crow
9 - Hob
10 - Hob
11 - Old TV; shows short video
12 - Beets; battle
13 - Exit to Floor 17
14 - NEW EVENT - Bakaneko

s - start
1 - Mel; might trigger right on arrival
2 - Crow
3 - Ryan
4 - Weird fishes; you can reach them by walking trough doors instead of using them; no interactions or dialogue
5 - Door back to Floor 16

another chaser floor

s - start
1 - Crow
2 - Exit to Floor 18; answer "To end suffering" to earn 10 exp

s - start
1 - Mel
2 - Goblin
3 - Crow
4 - Beets; battle
5 - Twins
6 - Onibi
7 - Goblin
8 - Old TV; shows short video
9 - Reeeee; answer "Yes" to gain 100 exp or "No" to start battle
10 - Reeeee; same as above
11 - Portal to FloorSchool2; two-ways
12 - triigers only if you got Chii's Coin from FloorSchool2

Achievement - "Chii"

13 - Exit to Floor 19; answer "A fungus" to earn 10 exp

s - start
1 - Chii; answer "Chii what the crows be sayin?" to get "Chii's Coin" item; congrats, now you can talk to crows
2 - Portal back to Floor 18

s - start
1 - Crow
2 - Skeleton; Skill trainer; teaches "Sacrifice" skill
3 - Byuam; Skill trainer; answer "Yes" to learn "Stone toss" skill
4 - Skeleton
5 - Skeleton
6 - Brock Lee; battle
7 - Skeleton
8 - Skeleton
9 - Mel
10 - Portal to creepy house and then to FloorEyes if you knock on the door; two-ways
11 - Exit to Floor 20

s - start
1 - Battle
2 - Portal back to Floor 19

s - start; Mel chimes in; answer "Any tips?" to get both a heal and a useful tip; she will refuse if you upset her even once before
1 - Ibukorukor; sells armors and potions
2 - Stand here and press Use button for a strange hidden picture
3 - Chrunobog; boss battle

Unmissable achievement - "Defeated Chrunobog"

Inside the Town Hall search the drawers.

"Shepherd of a Linear World" achievement

At this point, if you have at least two "upset Mel points" she will ask if you trust her. Answering "I trust you" zeroes "upset points" and Mel turns neutral to you again. Answering "I do not trust you" will make her leave you.

s - start
1 - Crow
2 - Miggy
3 - Brock Lee; battle
4 - Axolotl; if you searched for devas with it before, gives a hint about the location of the library
5 - Old TV; shows short video
6 - Brock Lee; battle
7 - Exit to Floor 22
8 - NEW EVENT - Sickly Woman

s - start; also Ibukorukor that sells armors and potions
1 - Byuam
2 - Golden Pig; interact with it twice

Achievement - "Pork Evil"

3 - Dibsy; battle
4 - Reeeee; Skill trainer; answer "Malt Liquor" to learn "Tripple attack" skill
5 - Eeer
6 - Dibsy; battle
7 - Dibsy; battle
8 - Dibsy; battle
9 - Old TV; shows short video
10 - Mel; of course from here on out assume that her events only trigger if she did not leave you
11 - Byuam; answer "I'm not hungry" to initiate battle; answer "Sure, yeah" to gain 100 exp
12 - Exit to Floor 23; answer "Yes" to gain 50 exp

s - start
1 - Mel
2 - Black figure
3 - Eer; battle
4 - Dibsy
5 - Hob
6 - Eer; battle
7 - Old TV; shows short video
8 - Eer; battle
9 - Ghost
10 - Mel
11 - Hidden fish; to reach it, go through the door instead of pressing use
12 - Exit to Floor 24

s - start
1 - Portal to FloorBranchMickzone; two-ways
2 - Satyr
3 - Reeeee
4 - Eer; battle
5 - Ibukorukor; sells armors and potions
6 - Eer and Byuam; battle
7 - Ghost
8 - Old TV; shows short video
9 - Ibukorukor; sells potions; if you answer "No" battle starts
10 - Eer; battle
11 - Exit to Floor 25

s - start
1 - Beehive; this one has additional lines of text
2 - Portal back to Floor 24
3 - Mel
4 - brandon

Achievement - "brandon"

5 - You can get another Menthol ciggy from here
6 - Dibs; has a lot of dialogue lines
7 - Snail
8 - Hob
9 - Queen Bee; accept her task; travel around the map collecting pollen from flowers (don't pick the flowers!); return to Queen Bee and you will be teleported to FloorBranchMickzone2
10 - Mel
11 - Flowers

s - start
1 - Dead Flower; battle
2 - brandon
3 - Dibs
4 - Snail
5 - Hob
6 - Queen Bee; battle; will teleport you to Floor 24 afterwards

Achievement - "The Bee's Knees"

s - start
1 - Portal to FloorWhale; two-ways; it is a completely empty place so no map needed
2 - Mel; answer "Who made them?" to activate "Chii Statue" variable that is needed for True Ending. If Mel is gone at this point, slightly different scene will play out and you will recieve "Chii Statue" variable automatically.
3 - Lex; he will be mad about the menthol cigarette and you will lose a knowledge level, but this is needed for later achievement
4 - Ibukorukor; sells armors and potions
5 - Onibi
6 - Ryan; battle
7 - Old TV; shows short video
8 - Two Ryans; battle
9 - Mel
10 - Exit to Floor 26
11 - NEW EVENT - Jophiel

s - start
1 - Portal to Floor17(Caf); only available if you gave the cigarette to Caf; two-ways
2 - Chii; ask "Who is the crow deity?" (if you don't have the option, it means you did something wrong before and True Ending is unreachable)
3 - Robe
4 - Robe
5 - Old TV; shows short video
6 - Twins; answer "Pretty good" to get 10 Potions; answer "Awful" to be cursed with bad luck (it has a variable, but doesn't trigger anything; probably cut content again)
7 - Rat
8 - Fish; only available if you failed the fishlord quest by giving Sweet Corn to Buddha; you can then accept the task of killing fishlord
9 - Exit to Floor 27

don't bother talking to pigs, they are copies of the one we already met

s - start
1 - Caf; gives you "Golden Pig Chain"

Achievement - "The Golden Pig"

2 - Crow
3 - Portal back to Floor 26

s - start
1 - Portal to FloorForest; two-ways
2 - Exit to Floor 28

s - start
1 - Portal back to Floor 27
2 - Hidden Portal to FloorLibrary; two-ways

s - start
1 - Portal back to FloorForest
2 - Ghost Librarian; gives you Candelabrum; answer "Yes" to gain access to Bhool bhulaiya; talk again to teleport there (FloorHuge)

Achievement - "Bhool bhulaiya"

3 - later here will be a portal back to Floor 30.
4 - Candelabrum opens a portal here. Said portal leads to a secret merchant.

yellow - starting point, when you enter through Ghost Librarian

red - Portal back to FloorLibrary

green - books you can read

pink - Portal to FloorBranch 2; nothing of note really, only locked door; but if you just near the end of the True Ending branch, the locked door will open for 12000 dust, initiating a battle and giving you "Skull and Feathers"

orange - Portal to FloorHospital; empty, but the altar room has a use now - interact with the altar to upgrade your "Golden Pig Chain" to "Platinum Pig Chain"

purple - Portal to FloorJapaneseTown; only available if you agreed to kill fishlord; near the Buddha statue you will meet a fish npc, tell him "I have come to kill your lord" to initiate boss battle; for that you will get "Lord's scales" armor item

s - start
1 - Special Crow; only appears if you have Chii's Coin; if you did everything right to unlock the True Ending, you then can ask it about the Crow deity to teleport to FloorCrow; talk to Crow lord there, you will be teleported back after that

Achievement - "Crow lord"

2 - Mel; only triggers if you've met the Crow lord
3 - Ryan; battle
4 - Byuam and Eer; battle
5 - Byuam and Eer; battle
6 - Ibukorukor; sells potions; if you answer "No" battle starts
7 - Exit to Floor 29; choose "Proceed down the road" and then "Continue forward"

s - start
1 - Crows event; only available if you have Chii's Coin and picked right lines while exiting Floor 28; choose either "Pride" or "Fear", then "Duck into the forest", then "Climb it"

Achievement - "Chariot"

This is a good place to make the second savefile - this will allow you to quickly see three endings (and we already made the savefile for the 4th, Bad Ending)

Talking to Chii will lock you into True Ending route!

2 - Chii; if you've met the Crow lord, you will be teleported to FloorMeadow where only Mel awaits you; two outcomes are possible here:
- if you have at least one "Mel happy point", she will accept death without a fight;
- if her disposition towards you is neutral or she left you after the fight with Churnobog, you will have to fight her; loosing here initiates Bad Ending;

After Mel's death, Chii apears in the meadow; talk to him to go back to Floor 29

Achievement - "Rekindled Purusha"

3 - Portal to FloorForest; only available if you visited Bhool bhulaiya
4 - Reeeee; battle
5 - Reeeee; battle
6 - Duck (lacks a sprite for some reason); battle
7 - Skeleton
8 - Ibukorukor; sells armors and potions
9 - Mel; only available if she's still with you, of course
10 - Exit to Floor 30

s - start
1 - Crow
2 - Portal to FloorLibrary, requires candelabrum item
3 - Mara; three outcomes:

- if you are on True Ending route, reject Mara's offer and fight her;
- if you are on Normal route, accept Mara's offer to get

Achievement - "Accepted the offer"

- if you are on Normal route, reject Mara's offer and fight her to get

Achievement - "Defeated Mara"