Here's my first XNA project: Particle Wars

Players: 1-4 (really 2-4, but you can buzz around in it by yourself if you want).
Controls: Xbox 360 controllers required
    Back button: exit game (Player 1 only)
    Start button: start game (Player 1 only)
    Left stick: movement
    Right stick: emit particle weapon
    Right shoulder: select RWB emitter (fast but weak)
    Left shoulder: select GY emitter (slow but powerful)
    DPad Down: turn off background (Player 1 only)
    DPad Up: turn on background (Player 1 only)

TODO:
    Add two more emitter types that have splash damage, map the resulting 4 types to the DPad
    COMPLETELY reorgnize the code

It started out as a technology demonstrator, but eventually morphed into a "game". The code is UGLY so, please don't look (or at least don't tell me how bad it is... I know, trust me.)

And if anyone is interested, all of the graphics were made from scratch in Paint Shop Pro 9. As you can tell, I aint an artist... circles make for easy art AND collision detection!

Update: 9/23/2006 3:30p
    Added rudimentary audio
    Animated title marquee