Hi,
Very nice idea. I also think that the movements are a bit too fast, it is very difficult to control the box. For this reason, it is very difficult (for me, at least) to score better than 3. I would have loved to arrive at a point where a rain of balls and other objects fall down from the ceiling making it impossible to stand (not because of the controls, but because of the backfire of the bouncing objects).
Anyway, very well done given the short amount of time!
If you feel, please, come to review also my game :D