Thanks for this.
It is great, but it's missing an important feature, in my opinion. Dungeon maps are usually numbered to allow writing a key for them. I know I can just write the numbers directly on the map or even just write the whole key directly on the map, but having them in that nice font, ready to go, would be great.
I also have to click a lot to get a properly interconnected dungeon and it'd be neat to be able to choose sizes, etc, but I suspect that's out of your intended scope?