This improves the variety of level themes seen, especially on shorter runs. Level 1 is still always an urban theme (high number of materials and also the most modern theme), and the second will still be anything but urban. Beyond that, simple random selection has been replaced with a shuffle, increasing the number of themes seen and insuring all themes will be seen be the time the option to beat the game arises.
Also, fixed an incorrectly rotated normal map on one material, meaning the old wood should look better.
...still no idea how to solve some old bugs, but most of these only produce minor jank rather than anything serious.