In my opinion, your game has an amazing atmosphere, and great visuals. The biggest problem here is the sound design.
First of all, the footsteps are the exact same as when you crouch, run, walk, making crouching and walking carefully feel poinless.
Also some lights just don't buzz, which is strange.
The enemy should have better footsteps too. It's very easy to recognise it's just four exact same footsteps just playing in a loop, which ruins the immersion.
The monster is fine, however the jumpscare is cheap, and literally just a jpeg. The loud jumpscare noise may scare me, but also leaves me pissed off at the game, since it's so cheap. This isn't an 8 year old creepypasta game.
I no longer wanted to play after being jumpscared twice.
That being said, great idea, and ALMOST perfect. In my opinion, you should update this and change up all the sound effects, and replace the jumpscare with something not as crappy as a jpeg with a sound effect.
Good luck!