Very cool! The atmosphere was very eerie and I was scared to run into a room aimlessly for fear of running into a monster. The blocks were pretty scary, huh?
My only qualm is that right after you have to push all those buttons in the room that spider thing's in, I kept dying on the next room because I'd walk a little too far and run into those wall monsters. I died, like, four times because of that... in a row.
Overall, great game!