Lack of sound
The idea was alright to begin with but the lack of sound pushed it from being neat to annoying.
No sounds for bumping into a wall.
No sounds for landing.
No sounds besides a jump and death sound really.
If you are going to take away one of the senses to use the game, you could have augmented sound to really make this game thrive instead for the most part it's a simple platformer with a small gimmick.