I played for as long as my computer could handle, but I never really understood what to do. There are several points that I can touch for future improvement :
First of all, the aesthetic is good, though you don't need such high quality lighting. Just make it believable, instead of going completely overkill and causing lesser computers like mine to run at 15 fps.
Second, it would be great if you had a main menu. This will allow separation from when the players load the program and play the game, overall increasing immersion.
Third (and this could be a LARGE improvement), try adding control hints if you update it. It was very confusing having to press every key on the keyboard the first time...and then sometimes it's LMB instead of the F key to interact. Even if you don't do this, I would suggest changing interact to E, as F is usually Flashlight in horror games.
I unfortunately didn't get to the monster or anything. :/