One question straight away. The meaning of your game is the first sentence showing up, right? Or is there anything more? I spamed the green planet until the velocity was too high for the line renderer. See screenshot below :D
Anyhow, the music is really relaxing. The visuals are nice and clean. The controls are smooth.
But I have to say that I can't really call it a game. I would call it an interactive music player or so :D I'm really sorry.
Here is the screenshot. Don't want to be mean, just want to share my crazy creation.