Whirled! is a mod of the Spacewar Game as an entry to the Dream Build Play Warm-Up competition. The main features are:

Cooperative Control:
While Whirled! is a single player experience against AI controlled enemies, we implemented controls and game play that make it not only possible but advantageous to play cooperatively with a friend. This is done by having both players control different aspects of the same ship. We've called this "Cooperative Control" and is really the intended way to play.

Single "Bullet":
Whirled! is a strategic shooter where each ship has only a single ballistic "Blade" to use to attack opponents. Firing and recalling the blade is done with the Right trigger; however, the blade is omni-directional and the player has the option of controlling the launch direction by using the Right analog stick. The player may use the Blade in defense as well by blocking incoming blades.