I can barely hear the ambient music, and there are no sounds when the character jumps or when the player shifts blocks. That makes it a little boring. Also, the character isn't synced with its feet and the speed in which advances. The controls aren't great either. I believe you might have rushed a bit with this one.
HOWEVER!
The reason why I'm giving you 4 starts is because of the original concept. I absolutely loved it. Keep your ideas coming :)