When I first tried it, I waited 5 minutes or whatever for the loading to finish, and it said something like "Error in map generation" and told me to close the game, so I thought it was a prank until I read the comments.
This was a really meaty crunchy experience. I like the wealth of options you have to experiment with. I think some of the areas were inaccessible in my generated world (forest, parts of the tower) but I still managed to win.