Nice one Jeffrf
The gameplay was fun and the explosion effects are great.
What made it hard was that when you hit your enemy they immediately fire back. Once i was used to that it became much easier.
This is a bit trivial - but for me you have too many conflicting elements of the game. You are a medievil knight that shoots stars out of your sword - shooting at bomb dropping parachuting turtles - while space ships flying around in the background :)
I know that its a just a little game so it really doesnt matter - but still, i think it would present better if you stuck to a theme a little more, or at least tied the elements together a bit more.
Aside from that, thumbs up!