I'm a sucker for space-themed stuff, so this is definitely no exception. Loved the vibes and the sound design of the game a hell of a lot, so nice work on that!
I don't know how intentional the difference was, but on the first level, the gravitational pull of the planets were pretty strong and kept you well-grounded, whereas on the second level, pressing a key to move for too long sent you yeeting across space. I'm curious as to whether the gravitational pull was set per-level or per-planet because of that. :p
I agree with Steeley below that the fuel system could probably do with some fine-tuning, though not necessarily needing to be replaced with large bursts. Like, it's outer space, it's definitely supposed to feel floaty. It all kind of depends on how much emphasis you want to put on the initial aiming of the jump to get off the planet, and how generous you want to be with using the fuel system for both correction and direction.
Art style is pretty neat - little bit mixed at times with the hard black outline edge and flat colouring of the player and satellites but the more geometric and flashy looks of the planets. I like both styles, don't get me wrong, just think more could have been done to make them blend a bit more.
Overall, nice work, I really liked it!