Nice!
I had a lot for fun working this one out. Basically a retro planet defense game (reminded me of Clash N Slash - sooo not the same game). Once I worked out to stop rotating and use the center of the patch of brown approaching asteroid markers as my "up", getting past wave 10 and beyond was much easier. Really would have preferred full 360º play - but then you'd need an upgrade system (first upgrade: a HUD long range scanner!) and then the whole thing would play differently. Only gripe: needs a LAZER!!