Before the end I want to rate your game. One thing is sure - there is a good work on the aesthetic. The mood is great and mechanics are really smooth. The whole project fits with the theme. However I would like to see something more frenetic. It seems to me that it could be more interesting with a high firerate. However, what you did in a few hours is amazing. Thumbs up ++
Congratulations on the aesthetic. It's all very intriguing and suspenseful, however I was expecting a little bit more or maybe there's a lot more potential to that dark environment you've created. Most of all, I enjoyed the audio work (music and SFX). Nice!
One issue about shooting: I felt the mouse pointing gun wasn't very precise, it kind of went to one side or something...but heck, that is how my gun would work in a situation like this. So maybe if you continue developing this game (you should!), maybe you can add some more stuff (like in Legacy of Kain or something like that). So back to the gun..., yeah...if the gun is not all that fast and precise, at least you can run to a place, talk to a survivor (or read his/her notes), hide/explore a cave, whatever. I'm just making up stuff.
Got stuck on second wave the second time I played and couldn't find the last enemy to kill.