Just played you're game, it's rather fun tbh, however at the beginning it was a bit hard to tell how close you need to be to a planet before jumping. So other than adding some visual feedback while the player is still learning I got nothing to add. Good job :)
Here's our game if you'd like to try it and leave some feedback. (It's made in Unreal so it'd require a download, so It's understandable if you skip this one xD)
Tomo's Tiny Adventure by Sideways Games, Mariavel