Not bad at all
The bad: Graphic wise it's nothing amazing, the ships,characters & explosion need work, the backgrounds are a bit better though. Things just look a bit to simple, but keeping in mind that there's a lot of movement going on I can understand that things aren't to detailed to prevent a slowdown. Besides that it could definately use a pausebutton, and perhaps subtitles
The good: It's very addicting and it never gets boring. But the most important thing of all is that you've come up with some very original battles. The claw for instance was a lot of fun and very unique. This is what makes it stand out.
I'm definately looking forward to a follow up =)