Very good
This game is pretty fun, but I found that it got really difficult after a short time. The shield powerups became riduculous hard to get once they had three/four little escorts, so the only good way to get them was with a hard to acquire colour bomb. Of course, once you died you were pretty much screwed for your last two lives because it was really hard to get any shield again.
Still, waaaay better than a lot of stuff you see. Keep it up!