Really cool atmoshpere and nice graphics. The colors matches the darkness really well.
The floating head was a bit strange, maybe you could make it's position fix to one of the corners followed by the text. The jump height could be a little bigger because it was hard to jump on the blocks sometimes but nothing serious. The volume was a bit too low, I had to turn my own volume up by ~300% to hear the game more properly. These are merely technical flaws so the gameplay itself is still enjoyable :)
The story is insteresting and I liked the exploration aspect. Good job!