Very nice! When I first saw the screenshots I thought it was a bit of a crayon-physics ripoff, but this is truely a new concept. Has some nice unique gameplay elements in it.

I think such a game could do well on mobile devices. Have you ever thought of porting it to Android/IOS?
At the moment, I'm exploring mobile development and I'm brainstorming about good mobile-game concepts. This could be a rather nice one.

Keep it up!