Edit 1: Mode 2 is now less janky, and more spaced out than Mode 1. It even has multiple paths! Should it have a chance of three to a a floor? I could make it detect whether the floor above is very large, but the restriction of words + "punctuation" is kind of fun.
Edit 2: Yes, Mode "1+2" is just a combination of 1 and 2 at random. Mode 2 has had a few changes with the number of vertical routes. Mode 4 is an experiment. Mode 5 has hallways and staircases at the top, dissolving into chaotic caverns down the bottom... in theory.
Edit 3: If you want to, for some unknowable reason, save one of these dungeons, you will have to format it to centre-align on your own. Lines of rooms that go on for a ludicrous length then just end sudden actually (1d4): 1. Lead to a river, 2. Are a shortcut heading up/down several steps, imagine them bending in that direction in a loop, 3. Connect to a different dungeon or the Veins, 4. Lead all the way to the surface.