The art and concept are good, but I just can't get the hang of aiming, and just kind of gave up partway through trying to get anything more than one star. (That said, I've also made a game involving orbital mechanics (My Very Educated Moths, for a different jam), and had a hard time getting good at my own game. Maybe it's just hard.) At least they seem to lock in to the correct orbit if I get close enough.
Trying to think what could help... you could show what the trajectory would be as you're aiming, but then that might make it too easy... but maybe if you showed the trajectory on the first level (so I could get the hang of it) or showed the beginning of the trajectory or something...