X@Com
It all comes back to roguelikes in the end.
Well, I don’t know if I’d consider X@Com that much of a roguelike, despite the ASCII, random maps, and permadeath, but I’m not really one to police the genre. The map randomization is pretty basic, but present, and even in its current alpha-ish state the game has several mods that add more map types and gameplay modes.
The development appears to mostly be on hold while the developer works on Cogmind instead. Which may be for the best: Cogmind has some very nice ASCII-rendered weapons.