The asteroids are squares because unfortunately when I was making the game I was still in the early learning stages - this being my first major project that didn't take an hour to throw together - and didn't know how to program various things, one of course being irregular shape hit tests. Updating the look of the asteroids, although beneficial, would be quite a tedious task since what's done is done, and efforts would be better spent on fresh projects.
Feel free to offer suggestions and I will try to upload new versions regularly.
Sorry for the double post, but seriously, whoever the creator is, obviously has potential and should go about making much more complex games than this.
 "Space Shower"){kind=icon}
 "PopBubble 2"){kind=icon}
 "Ski Run"){kind=icon}
 "Globetrotter XL"){kind=icon}
 "Where On Earth"){kind=icon}
 "Second Game"){kind=icon}
 "First game"){kind=icon}
 "Dissolve"){kind=icon}
 "Ocean Explorer"){kind=icon}
 "New Space Age (v.1.5)"){kind=icon}
 "Red Driver"){kind=icon}