Yes, I feel like it's hard to make a map that wouldn't guide the player just by being there. Maybe just give a starting room with the door then the possibility to add, move or rotate rooms with 3 or 4 doors without limit. Then just allow to add and remove any connections within the doors. Maybe add tokens for the altars and that's all. That way that leave a lot of margin to make errors on the number of rooms and the connections then fix them later. And with absolutely no validation to say if it's ok or not.
I'll try it again after the update to how you made it, I'm curious about it.