An open-source, telnet-based roguelike written in Rust? I think I've just had nerdgasm :D
Sadly, when I've tried it, I've entered the world where there were no monsters (perhaps someone killed them before?) and no exit, just plain floor all the way through (I've scrolled right for quite a time). Still, it's a great concept, I think you should take it further, I'd definitely spend some time playing such a game :)
Oh, and feel free to check out my take on the roguelike genre, which is also happens to be open-sourced: https://itch.io/jam/gmtk-2019/rate/460262 :3