Nice concept put to use, and the visibility mechanic is amazing (hand sway + eye focus), would need sensitivity option for mouse however or less floaty feeling when aiming, as currently it feels too floaty when you need to kill the enemy quickly.
I can also tell you the monster that ran in the hallway down the stairs screaming was overdone with sound, and the monster with the bat making these weird noises was just funny to me, death animation underwhelming, these done at the very start and early sort of made me less anxous to continue.
I got stuck at the start in one of the rooms with the yellow doors because I didn't have a flashlight yet, and had to follow the faint light on the walls up close to get out of the room.
Now, the above points are for improvement, but overall it is very good atmosphere, I really enjoyed the part where I was in this big room with water, where I had to get my first set of keys, those sounds of footsteps in the water along with the somewhat uncanny scream was amazing! That is not a cheap jumpscare, and got my heart pumping.
Overall, I've read some comments here as well, you have got a good concept and mechanics set up, but don't overuse the amount of sound, keep it minimal, enviromental sounds, Amnesia series have always been good in their sound design, maybe have a look at them?