As a tool, i find it really interesting. If this had some sort of "play" function this would be awesome! Maybe som string-based save/load system so there could be a makeshift workshop with user-created levels.
The idea and potential is there, and i had fun after getting the hang of it. But i spent about 10~ minutes playing and making my dungeon and i found out that there is no play button and died a little inside ):
I'll keep an eye out for the project, because i truly believe this could become something rather big!