Cute art and nice visuals in general! The planet combining mechanic was satisfying when I was able to get them to collide, though I agree with some of the other comments that it was hard to tell where your planet was going to end up. It was also fun to just spam a bunch of planets and watch them orbit around. Good job on the game!
I played this on stream today (video here) if you’re interested in watching a playthrough of your game.