Good job, it feels good and, if you use gravity to your advantage, it's pretty easy to get the crystal. 
I would probably add some elements to avoid, where gravity pulls you, to add some difficulty.

Its fun to get the gravity feel of the planets, good job on working on the theme!

Great game! Matches the theme of isolation.

Mechanics were hard to grasp though.

Solid game love the music

Solid game with good visuals and sound. Well done!

the music rocks

That was a good time, it was fun figuring out that there were different mechanics for different planets.