I played through the whole game. It definitely has a bit of a Backrooms vibe.
However, I don't really understand the purpose behind some of the design choices. The energy requirement for the gun feels unnecessary. If you shoot too much, you can literally get stuck and be unable to progress.
I'm also not sure what the switch next to the energy blocks is supposed to do. Nothing seems to happen when I use it.
The enemy at the end is completely silent, and because it's so dark, it's often impossible to see. It also seems to be able to walk through certain walls. It ends up being more irritating than scary, and I don't think it's really necessary in its current form.
One thing I did like is that when I die or get caught by the monster, I keep the energy cells I've already collected. That's good, because at least it makes it possible to eventually finish the game.
I was also hoping for some kind of explanation or clues about what's actually happening around me. The rooms could also lean more heavily into puzzle-solving.