Interesting prototype, there are still some low hanging fruit that you could implement to improve the quality of life such as displaying the score, not having a big unused black space around the game, or adding a margin to the planets (making their colliders bigger than their visuals). A bit more complex but not that much would be to show your future potential trajectory while you spin (i.e. a simple line that goes in the direction you're pointing toward) so you can better time your jumps between planets. That would allow you to increase the overall speed of the game while keeping it playable, because it is currently quite slow. And for the last suggestion, but way more complex to do, it would be to give an area of gravitational effect to each planet, that would curve the player's trajectory, it would allow the player to try some pretty cool trickshots