Nice one!
I love it when games so refreshingly original as this get released :) I think the concept and execution was pretty amazing and it had me playing untill the end. I especially liked the whole upgrade thing and how you're fellow asteroids protected you.
I only wish maybe the asteroids would rotate faster as a default so when you release them they'd cause more carnage. And its a shame there wasnt an enemy that would dodge your asteroids intelligently, though i realise that would be a pain in the ass to program! (maybe in AR4 perhaps?)