Pros and cons are down below)
Advantages:
1. The game is scary, I don't know what's it about that monster but it's so terrifying! Well done! I think the way it moved wass very creepy! I was also scared that it might be able to detect me under tables, but thankfully it could not!
2. I loved the puzzle. It's so cool to fo through rooms and looking for stuff while literally feeling the monster creeping in from the back!
3. I also loved how different all the endings are! I think that's awesome! I replayed it 4 times, spend like 2 hours and it was worth it!
Disadvantages:
1. When the monster appears the body is still lying in the room when the player first heard the gunshot. I think it supposed to be the same body, right? So, you might want to make it disappear from the room.
2. I didn't see the tutorial about pressing Q to get the holy water out. Was it anywhere in the game? If yes - me dumb dumb, if not - than that's not very nice! Please, add it somewhere, I genuinely though that my game was bugged!
3. I also managed to break the game somehow. Check out the vid to see the problem. Somewhere near the start my crouch speed changed to my walking speed and vice versa. After I died it fixed itself but still, maybe you'll fix that)
4. I think that when the clock stroke, the monster should have come investigate the sound immediately. And it didn't come at all. It's just... The sound was definitely louder than main character coughing.
Overall:
I think the game is great! It was very involving and I enjoyed playing it a lot. I even went through all endings! Also, the game scared me a couple of times which means that it's a good horror game! I'll rate it 5/5 though there are still places that need to be polished.
Hope my feedback was useful!