The game is really nice ! The keyboard controls feel a bit odd at first and it would have been more natural to use the mouse position relative to the player but you get used to it after a few planets.
The gravity of the planets is a great addition as it helps with the landing. The planets look really great.
The only downside may be the lack of audio feedback when using the booster and when you are alone in the void. The game probably needs to fill this gameplay phase with something else to do otherwise it will be hard to keep players engaged.