I like the idea...
But I feel like the execution was a bit off. I read from an earlier comment of yours, jscdragon, that you whipped it up just for fun, and with that in mind is what I scored. Seems like this could be polished into a very fun game. However, the auto-fire of the ninja stars slowed it down, and there's the aforementioned clipping issue.
Overall, it's got it's kinks, but is still fun.