The repo has source code and a brief writeup, including run instructions. It’s an x86 port from Atari Basic. Actually, since this video, a contributor cut it down to 483 bytes!
Soothly this will bring on the Year of the Linux Desktop!
Thanks, Valve
Cool! I hope you enjoy it. It’s such a heartful game and its battle mechanics add more depth to the formula.
Extremely correct call.