Game loosely based on the original Spacewar!
Two ships duel in a gravity field. Gravity doesn't affect the ships themselves (which have spanking new anti-gravity devices), but it affects missiles launced by the ships. You can play against the computer, or two players can play with one keyboard. There is also a Gravity Wars mode, where the two ships do not move, and the players repeatedly specify the direction and velocity of their missiles.
Source Files (show merged sources derived from linked package)