I can't install the game via the itch client which is a tad annoying. You can fix this by checking the windows icon next to the uploaded file in the edit game page. This allows the installation button on the client to work. I'm not sure if it will work for .rar files though. I know it works for .zip.
Escape is a bit of a dangerous button to have for closing a game. I know you say it at the beginning but I feel its easy to forget and just try and open a pause menu. Also, most people will just alt+F4 anyways.
Left click is an OK control for interacting but I feel most people are more familiar with E. Although this critic is a bit more nit-picky.
I can get stuck rubbing against the walls. I'm fairly sure you can get by this in Unity by added a physics material to your rigid body that has its friction set to 0. That or perhaps using the built-in unity kinematic character controller which I don't think would have the same issue.
I ended up getting stuck in the room with the keys. I'm not sure if that puzzle was solvable once you're in it. It it wasn't, (if I needed something else before) I'd recommend not locking the player in an unsolvable area. From some of the other comments it seemed like there were other areas in the game. I'm sad I didn't get to see them.
Overall a pretty decent submission.
Edit:
Thanks to your explanation I was able to play through till the credits. The mirror mechanic was cool once I understood what it was but because of the way it was set up it didn't immediately look to me like a mirror; though again it was cool once I understood it. I like the variety in mechanics.
The wall sticking was still annoying. For the sewers I feel I should either walk faster or not have to back track all the way. The flashlight and stop moving mechanic was cool but the monster maybe made the sound for too long so I ended up just standing there for the whole time it growls.
Also I could see specular in the water without the flashlight making the flashlight being off not as scary.
The monster through the wall was cool and a little unnerving. I didn't realize until I made it to the big door that that was what you meant by "big" door I was kinda thinking some gate I didn't see.
Overall a pretty cool horror experience and I'm glad I got to play it all the way through.