Cool game! I bet it took a while to design some of those levels and make sure they were solvable?
I dragged one of the planets off the screen somehow and it got stuck. :(
Sorry for your troubles, I wanted to constrain the planets to the screen view area, but never got around to doing it :(
I did make sure I was able to solve the problems before making the submission, for the last one I just made sure I could finish the level :P.