I think it's a great idea to make such an emulation of a unix terminal with hidden easter eggs, but I would make it possible to write adequately (auto-complete on tab, up/down arrows, etc.). But I wonder what kind of audience it is intended for? It's just that if it's for the audience of programmers or admins, it's quite boring, and if it's for ordinary players, it's overwhelming. You can try to focus on a narrow layer of programmers - script emulation, knowledge of gnu commands, researching Easter eggs, maybe some real hacking - so that there is a gradual increase in complexity, and there are moments when a knowledgeable person will learn something additional. Maybe it would be better to do something to make a really working operating system run in the game, but these are just ideas)
When you release a global update, ping me, I'd love to play. But my main point is that clicking to type commands is a teeeerribly boring thing to do.