Good job on making each level unique, and using different enemies too.  Like the other comment said, some darkness would contribute well to the experience.  Enemy interactions would also be cool, such as being chased.

hey bro there is a bug in your game when ever  you crouch by holding down shift and when you release shift the player move at a much high speed and if you die like that you are spawned in the space without the level like this 

Level 3 is bugged and i won ! If i can make a tips, cause it's horror, maybe playing with a scene more dark would be better ! :D