Hi Gaara, thanks for your support!
So sorry the user guide isn’t working yet, I got sidetracked working on features. Its helpful for me to know that there is a demand for the user guide, I’ll work extra hard on that now, I promise. 
Once I get the core how-to-use info in I’ll put a draft online.
As for your question about boss characters: actors are assumed to be 1 tile large. Its easy to make actors occupy multiple tiles, but ‘proper’ path planning with actors larger than 1 tile (for example, making sure a 2x2 character can’t pass a 1x1 hallway) is not possible. To make a boss character occupy multiple tiles, I recommend placing him in one of his overlapped tiles and set the terrain types of the other tiles to blocking. I’m afraid I don’t have more advanced utilities for multi-tile characters right now. If you could describe to me what kind of things you would like to do with multi-tile characters I can try to come up with ideas for future releases.