Being a big fan of the 2 originals and one of those people who bought WFTO, I have two ideas for you:
The “wonkification” is missing. Google wonkification. It basically means that you randomly shift each vertex in your dungeon so that the walls appear to be less regular.
You definitely need lights and darkness. At the moment it doesn’t have the feeling of a dungeon but more the feeling of something bright and clean.