Eliminator by Jennifer Whitlow, Chris Occhipinti, Chris Henderson.

Our design for our game consists of two player sprites that each have missiles. The object of the game is to shoot at the other player without being hit by the center missile or the other player. After a given amount of time the game will move to a new level. In each level, the sprite in the center begins to shoot more missiles more often. When one player gets hit, the other player gets a point and the game goes back to an earlier level in the game.

http://www.bogost.com/games/student_atari_games.shtml