Did it in 3 rounds. Requires a lot of luck in first 2 so that in the 3rd you have 2 maxed out planets as close as possilble to each other, the bottom, and the middle, with an additional planet (any size i used +1 upgrade) above the two other ones in the middle (as close as possible). Shot as far to the side as possible and you should bounce wildly around and get it all. I think the earliest you can win is level 2 after you kicked ass in level one and get the above criteria.
 "Storm the House 3"){kind=icon}
 "Planet Basher"){kind=icon}