Looks nice, sounds good. Nice theme brought together. Enjoyed playing this one for a while.
The big bosses showed no sign of taking damage, and no idea of health. I wasn't even sure if i was doing anything with the first boss until it FINALY blew up after a while.
I progress to the "Best" weapons to quick. 2 power ups collected, then it seems no point collecting any more, as i have it as good as it gets. And at that point i was clearing the smaller baddies to quick.
I didn't get chance to try multiplayer out, nor the different ships, and i could seem to figure out how to.
With that said, I really do like the style and feel fo the game, and with a few tweaks and improvements, it'll do really well. I particular liked the background stuff :). and how it moved around dynamically to create a profession effect.