First of all, this game has a lot of potential and i love the work that was put into this. But at the current stage the game is frustrating to play... let me explain.

Primarily, the game is too grindy at the start. I believe to attract an audience or at least to maintain the noobs is: Scrap the infinity room design. It is actually a blessing to clear a diner or a foodstore that has a boss in it, because that has approx 5 rooms. You get up to 100 rooms in the apartments. Like why? Make that a late game feature... i dont want to look through every room, looting useless items constantly, just to find the key for the locked rooms. The starting area should just be a mission area IMO and less rooms.
- Note on this... It's a perfectly fine system for when you reach the city, level 30 area or etc... but does not fit the starting area and kills some immersion (for me) seeing that this apartment suddenly had enough rooms for a skyscaper.

Add a map feauture. The infinite room design is absolutely brutal trying to navigate what room you havent checked for the bloody key, or for a simpler early design mark fully looted doors with 'something' until they reset.

Stop the infinite spawn, make it at least a 5 min respawn timer for zombies. Also on this note, if you have fully cleared the room behind you, remove zombies randomly spawning in from the door of that room.

Make NPCs unlock doors - do this mission.. get this key.

If you need money for future development incorporate an ad scheme, watch X amount of ads restore your health by X every X amount of days. - ( I don't know how hard it is or if its posible to do this but was just a friendly idea, correct if im wrong).
Theres a lot i can add for future development but i'll just leave some simple fundaments for now in my opinion.

I want to see this game grow and improve, i think everyone who plays it knows the potential but leave in numbers because of the undeniable straight hard grind at the start. This is purely constructive critism and i hope you give a chance to read this, thank you.

First of all, this game has a lot of potential and i love the work that was put into this. But at the current stage the game is frustrating to play... let me explain. Primarily, the game is too grindy at the start. I believe to attract an audience or at least to maintain the noobs is: Scrap the infinity room design. It is actually a blessing to clear a diner or a foodstore that has a boss in it, because that has approx 5 rooms. You get up to 100 rooms in the apartments. Like why? Make that a late game feature... i dont want to look through every room, looting useless items constantly, just to find the key for the locked rooms. The starting area should just be a mission area IMO and less rooms. - Note on this... It's a perfectly fine system for when you reach the city, level 30 area or etc... but does not fit the starting area and kills some immersion (for me) seeing that this apartment suddenly had enough rooms for a skyscaper. Add a map feauture. The infinite room design is absolutely brutal trying to navigate what room you havent checked for the bloody key, or for a simpler early design mark fully looted doors with 'something' until they reset. Stop the infinite spawn, make it at least a 5 min respawn timer for zombies. Also on this note, if you have fully cleared the room behind you, remove zombies randomly spawning in from the door of that room. Make NPCs unlock doors - do this mission.. get this key. If you need money for future development incorporate an ad scheme, watch X amount of ads restore your health by X every X amount of days. - ( I don't know how hard it is or if its posible to do this but was just a friendly idea, correct if im wrong). Theres a lot i can add for future development but i'll just leave some simple fundaments for now in my opinion. I want to see this game grow and improve, i think everyone who plays it knows the potential but leave in numbers because of the undeniable straight hard grind at the start. This is purely constructive critism and i hope you give a chance to read this, thank you.