Not sure what the controls are though I managed to slam into the green one but nothing happened other than my ship stopped responding.

could figure out how the movement works

I could not finish the game. It is really hard to figure out how to fly the rocket to reach the other planet. I've tried more than 6 times with no luck.

It took me like 2-3 runs to figure out the controls and where I'm at with the ship :D some feedback of the movement would have been nice (like a parallax you mentioned), I liked the concept and the UI was nice (and helpful with the navigation actually).