Spinvaders 1.0.0

spinvaders is a direct descendant of the old "Space Invaders" type of game. This first public test release, version 0.0.1, is fully playable and may even be fun!
The game levels get progressively more difficult as you go along, with the aliens increasing in numbers and speed, and acquiring better, faster bullets.
Spinvaders features a point multiplier mechanism based on your shot accuracy. Each hit will increase the point multiplier (to a maximum of ten), and each bullet that goes off into space will decrease the multiplier.
When the multiplier reaches ten, you acquire the "super-gun", which fires more quickly, is slightly larger, and is more devastating when it hits; The alien which is hit throws off a couple bits of shrapnel which are deadly to other aliens, and then it falls burning to the bottom of the screen, where it is deadly to you.
The controls for the game are described at the startup screen, everything should be pretty obvious. One undocumented feature of this test version is that pressing "J" will let you jump to any level.
Enhancements:
- Spinvaders now has greatly improved sound effects and a SOUNDTRACK, thanks to David Tweet!
- Spinvaders is now an open-source project, hosted at http://www.sourceforge.net/projects/spinvaders
- Other small enhancements and bug fixes.