Nicely done.
I agree to a submission that bosses would have been cool, but i think this is a nice touch to the whole "asteriods" game theme. And to let something off my chest, it gets quite annoying when you see all these bad reviews from people who have never even had the courage to get up and put in the time and the talent to actually make a flash game. I understand completly that this was time comsuming. So to anyone who really rights a review saying "I can do better than that." make sure you actually have a submission that wasnt blamed so you might actually mean it. Very good game though, shield idea was sweet, cause i hated the old, you got hit, you blew up. Hope to see more submissions from you.