Hmmm...
Fun idea, nice graphics and some complaints.
1. No restart at the boss if you run out of lives (or rather no restart at all!).
2. You made that boss a bit overpowered with the lilte space you can move with so you die easily.
3. Combine 1 and 2 and people get frustrated to start over when they run out of lives.
Other then that it was ok.