o_O
I'm not sure if this is a glitch or not, but on level C I have been playing for over 20 minutes and I have yet to find a boss. When my hands finally got tired I tried to let them kill me but for another couple of minutes, I just kept taking damage although my lifebar was at 0. It seems as if I finally died, because there is a different music playing, but the score keeps rising and the enemy keeps attacking even though my ship isn't on the screen anymore.
Aside from that, it was a really fun game. Kind of reminds me of Zero Wing. Nice job with the graphics and powerups, etc.