Nice little game!
The music was good, and I enjoy the fact that the music changes for the bossfight =). I would have enjoyed some little sounds here and there however. The first music also have a bit of saturation (it's probably going above 0dB ?)
The graphics are good, I liked the style ^^.
The controls are decent, even if the character is a bit slow. The gameplay change during the bossfight was enjoyable, but why am I losing life when my projectile hits the boss' projectiles xD? I thought it was a really cool strat to shoot the bullets until I noticed that it hurts ^^.
Overall, it was a nice little game, good job =)!