Kasenbutt was actually based off something that ZUN drew during the Touhou Station Gartic Phone stream on December 26. https://twitter.com/richard_effendi/status/1607427884884578306?t=OaIpPKgO4XpPJEO...
I saw that and I knew what I wanted to do for this jam.
I didn't have the time to make voxel models for (different) buildings so the same house (in various different dimensions), the same torii in front of the Hakurei and Moriya Shrines and the same trees are littered throughout the map (also with the same snow and rock textures throughout the terrain).