30 Years of Vorticons: How Commander Keen Changed PC Gaming id Software On Dec. 14, 1990, Apogee Software released Commander Keen: Invasion of the Vorticons. It was the first in a series of PC shareware games that brought fluid, Mario-like platforming to the PC. It also launched legendary developer id Software. Here’s why it was special. Keen: Playful Console Magic on the PC The first Commander Keen game, Invasion of the Vorticons, is split into three episodes designed for PCs with MS-DOS. In the first episode, you play as Billy Blaze (aka Commander Keen), a kid who must travel to Mars to repel an invasion of dog-like aliens called Vorticons.