Game: Commander Keen 5: Goodbye Galaxy

Commander Keen in Goodbye, Galaxy! "Secret of the Oracle" (first released as shareware on December 15, 1991) Keen's newly finished homemade faster-than-light radio picks up a plot by the Shikadi to destroy the galaxy. He rushes to the planet Gnosticus IV to consult the Keepers of the Oracle, but discovers that they have been taken captive. Thus, the gameplay centers on Keen finding and rescuing the eight elders. This episode features huge levels and a wide variety of enemies and modified game mechanics. "The Armageddon Machine" After getting information from the Oracle, Keen lands on a massive Shikadi space station, the Omegamatic, nicknamed the Armageddon Machine, and seeks out the mysterious Gannalech. The gameplay centers on Keen advancing through the Omegamatic to deactivate it.
Each game uses different controls, most DOS games use the keyboard arrows. Some will use the mouse , "Alt" ,"Enter" and "Space bar".