If it's something longer term as a project, some other stuff:
D&D: The Hypertext SRD has 3.5, 5, and Pathfinder material for ideas. https://www.d20srd.org/ Most Nix variants have https://en.wikipedia.org/wiki/Daemon_(computing) in them ... it's dangerous in the darkness. Plus, there's lots of word jokes like "Bash the door down" style of play
Myst/7th Guest/Visual Novel: People in-thread are talking pictures. While command line seems to be the goal, still-frame imagery puzzles using bash commands would be cool.
The Emoji Movie/Cell Phone: Adventures in the land of appscrapers and their cobble-touch avenues as your Nethack/Rogue icon delves the "open source" nix of the phone hardware.