Good work. I like how you took a simple concept, bouncing from one planet to another, and ran with it, expanded it and managed to make 10 different levels. Virtually all of which were too difficult for me! The UI was simple, worked well and fitted with the overall design.
As feedback I guess I would say, make it easier! :-) I think a restart button would be useful so I can destroy the rocket and start again quicker. Perhaps have an bought upgrade so we can see the curved path a firing route would take, but only allowed to be used once. You have to play a certain number of levels to afford to buy it again.