Nicely polished; the in game instructions were a little too brief (I thought for a while that I was meant to be launching the planet with a pull-back and-release mechanism), and the difficulty curve seemed strange (some later levels seemed completely trivial as the start and goal passed right next to each other), but overall the game felt very clean and smooth, and with a little more meat it could be a nice mobile pastime.
I did appreciate that winning after the failure text appears still give you credit for the victory. :)