Vortex is a game for iPodLinux/podzilla based on the arcade classic Tempest by Dave Theurer, but heavily influenced by Jeff Minter's "Tempest 2000".
My goals for it are to try to get gameplay similar to the original Atari arcade version, with some aspects flown in from Jeff Minter's Tempest 2000 version. I'm taking the webs from the original, and powerups and visualization from '2000, although I'm sticking with the original's Vector engine, rather than 2000's pixelshatters and such.
I'm taking a cue from Tempest 2000, and there are two versions of the game. "Vortex Classic" is a basic version with few screen effects. This should work better when playing music in the background. "Vortex 2K5" has solid shaded objects, starfields, and generally looks prettier. Game AI is identical for both versions.