I low scored this, but it hurt to do so.
Okay, this game felt like a really old school coin arcade game, one with only moving parts. If it had been a game like that, I could easily see myself burning hours at it. However, it was a Flash game, and I found it lacking.
The turning arrow, as opposed to say an aimable one or a first person approach, made for very limited interactivity. The limited rate of fire and ~8 possible firing angles made it way too limited.
I commend you on attempting claymation rather than bad Flash art. Your clay work looks like mine did 2 years ago. The bad news is that I sucked 2 years ago. If you continue to use this method, and I hope you do, go to a real art supply store and get some good modeling clay and about $20 worth of finishing tools. And don't be afraid to make your sculptures bigger, you don't have any scale to judge them against right now, and bigger means that your mistakes look smaller.
All in all, a game that showed potential, but nonetheless sucked.