Try Change Air Blade. Sometimes you'll pick up a powerup that allows you to play as the boss.
It's even more common in multiplayer mode come on someone play on Kaillera with me 
Anyway, this looks pretty cool. I want to play!
the one playing on the top position will win :p (or is the AI on single-player that terrible on the bottom position? All I know is that the AI gets cheaper on later stages, spamming the boss form apparently without explanation)
I've finished all stages with all ships (except the cloud, which is only for subscribers or something), there are some weapon combinations that are worth spamming (while some of the higher/lower level attacks are worth forgetting :p). Liked some of its stages (especially those involving survival), didn't like the ramming stages much, though it's quite easy to manipulate the enemies (there was one ramming stage that I liked, one where I had to ram shots instead of enemies). Liked the stage descriptions for most of the ships :p
However, for a flash game, this has yet to beat
Pararalyzer :p
