Zappa

From website: It is still in development, but here is the basic idea of Zappa: Classic vertical shooter, with unique hit-point system: All ships and bullets have RGB color values. When a bullet hits a ship, the bullet's color value is subtracted from the ship's color value. When a ship becomes totally black, or RGB 0,0,0, it explodes. Bullets' colors are generated at the moment of their firing, and they equal the color of the ship at that moment.