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.