I absolutely love the music! That would be my favorite part. But please turn the monster guy's volume down, it's so much louder than everything else, so if I ever wanted to turn my volume down enough for it to not blow up my ears, then the whole rest of the game would become practically mute at that point. It would also be cool if you had his volume adjust depending on how close he is to the player, because as it is now, his little "AYYYY"s aren't giving the player any information. There really isn't any reason to be scared of/worry about the sounds he makes because they don't mean he's close or anything. This game could also really benefit from a bit of background ambiance to make it feel a little spookier, and a little less sterile.
I also really want to compliment the monster's animation, particularly when he catches you, very spooky. :)