Due to really poor sales in the app store (kinda expected since it was just an astroids clone) space rocks is now free. When I get around to it, I will post up the source code on github. It was written with JS using the canvas element for drawing. It was bundled into an iOS app using phonegap.
If you have an urge to hack on it, just post a comment here, and I will post up the source earlier (right now it is a low priority).
Space Rocks Battle Edition for iPhone, iPod touch, and iPad on the iTunes App Store