That was fun! I really enjoy physics based games and (even though I sucked at controlling the little spaceship) I really liked it. Nice idea, good visuals, nice sound design, very good all-over! The only criticism I have is I couldn't really see much of the planets' orbits, maybe a slightly more zoomed-out camera would be nicer. But maybe this was done on purpose, as part of the theme, in which case ignore what I said. :P