Cool concept, and nice game jam sized game! The art was nice and consistent (although, I recognize the player sprite - Kenney.nl, I think? I use his assets a lot :-)) and all felt good together. I love the high score tracking, that's a really nice arcade-y touch. I did encounter a bug once, where the game locked up when I while I was traveling between planets. But, really, amazing job for a first game jam! :-)