'kay, let's see...
I needed many trials to get the first level, beat the other two in the first try. Overall I think the only problem with the game is bad physics. Some music would have helped too, and if the size of the rock actually meant something motion-wise.
The art of the game is OK but it can be improved if you give it some more time and dedication, I think you're up for it.
Overall a decent time killer, but only during five minute before you beat it to probably never come back again.