I must say, I expected this game to be a lag-fest.
Much to my surprise, however, even my not-so-great machine managed most of the levels fine. The only one that really clogged it up was the one where a bazillion tiny space-invaders came rushing towards me when I had the lightning powerup. My computer almost had a fit.
Gameplay was great, very addictive. I quickly became absolutely engrossed in it. The music was very fitting, too, but why did it have to stop when you died?
My only slight quibble was that I would have made the red asteroids come in a little sooner in the game. With a couple of powerups, every Asteroids level before that one was hilariously easy. Still, a fantastic game.