In that set, there's less autotiling, there are just 2 different walls (as to whether there's a wall to the south or not); so my code supports the two versions. I don't intend to make autotiling as complex as in the more detailed tileset.
Good catch :-) The pixelart version of the game will be a different game, because it won't be a single dungeon and some of the game core mechanics have changed (melee/ranged attacks hit system). The new system is easier to understand and easier to present, so that it is easier for me to internationalize the game. Previously it was impossible (because there were a lot of walls of texts).