Awesome, thanks for trying it :) This looks like some kind of GPU issue, the tiles are supposed to be transparent but their top part seems to be invisible... There's something weird going on between the transparent material and the lighting source, maybe OSX handles it differently, or it could be a Godot bug. I'll have to investigate further!
Well, I'm very much into procedural generation at the moment, and the algorithm is fairly basic, it's just a drunkard walk. Pathfinding, camera, menus, texts are all handled by the engine (which I know pretty well) so I was able to focus on the rest. Visuals are also very simple, everything is made of 8x8x8 voxel models with a pure white texture and transparency applied to the floors and stairs, and RPGiaB's voxel editor is very fast when you're used to it. Sounds were created in a few minutes with the integrated SFXR. The big headache was managing the stairs, which are still broken in certain situations, but hopefully not their navigation paths.