Very very good game, I am really impressed! The ambiance is 100% achieved, i was frightened so much !! Audio, art, gamefeel, setting, mood, progression, tutoralization, ... everything is absolutely great!
I have 2 remarks to make :
1. reminds me a lot of "Perception". Maybe you know the game? (https://store.steampowered.com/app/426310/Perception/) The core mechanic is similar (though not the same puzzle concepts revolving around the perception limit).
2. I think it's intended in a way, but the feeling of ammunition being rare and precious is limited by the fact you can die & retry levels as much as you want. Sometimes I purposely used them all simply to understand the level layout, then committed suicide, then could skip the early shots of my gun as I had the map in memory. I think there are many ways to address this though! Longer levels, punishing spamming with a mob killing you, going to previous level if you die too much in current level, making the flash only light close area... these are basic suggestions you could start from!
As always, ignore my feedback if it doesn't fit your vision :)
Congrats again for your game!! :D Cheers