Dave Gnukem

Dave Gnukem is a 2D retro-style platformer shooter inspired by a famous proprietary game Duke Nukem 1.

Plot
The game takes place 8 years in the future, from whatever the current year is. Evil Dr Proetton is trying to infect and cripple computers around the world with software called SystemD. In order to save the world the player has to find a floppy disk with Devuan and install it on the main computer.

The game proceeds to explicitly mention that resemblances of any actual people or entities are purely coincidental.