This game reminds me of Angry birds space, which is a good thing! Pretty nostalgic.
Having the choice to either sacrifice the planets or save them is a very cool mechanic, gives me basically two approaches to all levels. The other ingredients are very slightly implemented, but the sacrifice one definitely is implemented well.
The game is difficult and could use a curve that shows you approximately where you're going to go based on gravity. But I appreciate the previous arrow staying! Helps a lot!