- fixed the left-moving asteroid bug
- added Thomas' "vector graphics" from here. Use right difficulty to select style
- added HMOVE data to left/right shift large asteroid graphics. The shift table needs more work, but it'll do for the demo.
- added a "wrap zone" so that the large asteroid now smoothly goes all the way off the top/bottom of display before appearing on other side. Smaller asteroids will be offscreen for a little bit as they fly through the wrap zone.
My experiment's done for now, I'm back to work on Frantic. I'll turn this into a full fledge game at some point in the future.