The first level will now load up when selecting 'start default party' and it is possible to walk around a bit. The Gui (playfield, compass, inventory) is still completely broken, but at least the level blocks and some of the decoration shapes are drawn correctly. Monsters will be drawn, but their anim frames are mixed up, so they will always face the wrong direction and cannot visibly attack.
Reorganize all files in sub directories. The file placement isn't as intuitive as it might be for other engines, which is probably the reason why this hasn't been done before.