After the first part of the game that is the same regardless of the ending the remaining places in the village open up and I recommend at least exploring them, before looking at the walkthroughs for the different endings.
You can get all endings in one playthrough as after achieving an ending you get the option to continue with another day of the loop.
If you make a mistake during the dialogue you can quit to the main menu and reload to try again instead of having to wait until the next loop.

Move the right and left hand down until the image in the crystal ball becomes clear.
This first choice doesn’t matter and neither does the second, so pick whichever you like best.
Click on the spellbook.
To leave the spellbook screen again click on the house-shaped icon in the upper left corner. Drag the ingredients onto the altar in the middle.
The next choice also doesn’t matter.
Click on the bed to start the next day.

To head into the store click on the door in the background.
During the conversation with the inquisitors can get you some additional information early if you choose:
>No idea…
Followed by:
>Where can I find you...
To head into the village click on the open door to the right. The door to the left just leads back to Amelia’s room.
Head to the Mill.
Click on the bell to learn about Cecilia.
Click on the spellbook again for the new spell.
Head out into the village again and visit the Woods. Pick the Berries on the bush.
Go back to Amelia’s room and prepare the health potion.
Head to the Mill again.
Return to Amelia’s room and go to sleep.

The next morning go into the Woods to pick the Berries. Then prepare the health potion again and bring it to the Mill.
In the evening return to the Mill.
The next day check your spellbook for all of the new spells.

This is where the paths diverge and also where the spoiler section starts.

Head to the Cemetery and click on the tree trunk.
Then head to the Church to talk to the pastor about the Wood to unlock the option to get it.

The next day head into the Street and get the Wood from the farmer.
Next go into the Woods to get the Feather from the bird with the help of the birdhouse.
Then pick the Sunflower by the Mill.
Perform the timeloop spell again on the altar.

Visit the inquisitor in the Pub in the Evening to unlock this path.

At the start of a new day ask for the personal item from the inquisitor by choosing:
>Try to get a personal item for the death spell...
Then:
>Money...
And lastly:
>Exchange...
Now go into the Woods to get the Berries and the Feather using the birdhouse. Also make sure to open the trap to later get the Skull.
Prepare the health potion and perform the back in time spell.
Bring the health potion to the Mill.
Now go back to the Woods to get the Skull using the knife on the deer.
Prepare the death spell in the cauldron. Now go to the Cemetery with the death potion in hand to complete the spell.

You will need to talk to the inquisitor in the Pub in the Evening first.

The next day talk to the inquisitor in the Church.
Move through his dialogue tree as follows:
>What is he doing here...
Then:
>I came for the same reason as you...
Then:
>Is something bothering him...
Then:
>Share a personal problem...
Then:
>Ill friend...
Then:
>Ask if it helps...
And lastly:
>Offer help as a witch...
This leads to a death, but unlocks this path.

Go into the Woods first to pick the Berries and get the Feather with the help of the birdhouse.
Prepare the health potion and perform the back in time spell.
Head to the Church again to talk to the inquisitor.
This time choose:
>I know about his son...
Then:
>I know you're praying for him...
Then:
>Because I will cure the miller...
Then:
>Your companion drinks himself to death...
And lastly:
>The day is repeating...
Now head to the Mill to deliver the health potion.
In the evening head to the Mill again.
This last choice has no impact on the ending anymore.

Surprise!
This spell doesn't do anything useful.
Get the Horseshoe from the Blacksmith in the Street.
Pick the Four-leaf Clover in front of the Church.
Prepare the potion in the cauldron.


Bittersweet ending
You let the fate be as it was intented.
Get the Wood from the farmer in the Street in the Morning after checking the tree in the Cemetery and asking the pastor in the Church about it.
Get the Feather from the bird in the Woods using the birdhouse.
Pick the Sunflower from the Mill.

Dark ending
You used dark magic to kill the inquisitor, saving Cecilia and yourself.
You need to have talked to the inquisitor in the Pub in the Evening first as a prerequisite.
Get the Cross by choosing "Try to get a personal item for the death spell...", then "Money..." and lastly "Exchange..." at the start of a new day.
Pick the Berries for the health potion and get the Feather for the back in time spell from the Woods. Don't forget to open the trap!
Perform the back in time spell. Then bring the health potion to the Mill.
Get the Skull from the Woods.
Prepare the death potion and complete the spell in the Cemetery.

Merciful ending
You convinced the inquisitors and saved Cecilia.
You need to have talked to the inquisitor in the Pub in the Evening first as a prerequisite.
Head into the Church in the Morning and talk to the inquisitor. This first time you will die, but this too is a prerequisite.
Pick the Berries for the health potion and the Feather for the back in time spell from the Woods.
Prepare the health potion and perform the back in time spell.
Talk to the inquisitor in the Church again.
Next deliver the potion to the Mill.
In the evening return to the Mill.