Yay physics!
I'm going to jump on the "it's too short" bandwagon. This is a great physics-based-knock-things-down game. I'm (arbitrarily) guessing that most games of this type usually feature at least 20~25 levels, which I feel would have been a good amount for this game.
But you still win though, now I want you to make more of this game. :D
Awesome game. I'll probably still play it a few more times.