I think for a game jam you can't do any better. I got every upgrade and then got 100 more crystals just for fun. It was fast, easy to understand, looked beautiful, sounds amazing.
The theme feels a little lacking only by comparison to how great the rest is, I wish there was a little more reason to explore than just getting the crystals, but that's a nitpick. Otherwise I think just about the only real "problem" is the planets are a little hard to see, and it felt kind of like I was just randomly clicking around until a saw a little glint.
But yeah, incredible job on the game, it's great!