Love the art style choices: why use programmer's art when you can just use a cube? :D
Other than that the game needs a little bit of polish, it's kind of frustrating having to restart a level because you scaled a cube a little too much because you mistimed a jump, I have no idea if it could be better to implement an "undo", or have the cube scale faster, or have the ability to freeze the cubes in place once they are in the position you need them to be