Promethean - A procedural dungeon generator in C#

I’ve gotten a first version of a procedural dungeon generator written in C#. I aim for this to be compatible with
the Unity but at the moment it looks like Unity isn’t a fan of a List of Lists. You can see the code on
Github and view some generated floor maps in the browser
here(not longer hosted).
The browser rendererjust renders a bunch of coloured tiles on a canvas. Each colour represents a different piece (inside corner, outside corner) and/or a pieces orientation.