This is excellent in every way so far. The only thing I'd change/add so far is the ability to switch between old and new graphics/music and to mix and match the two.
I'd like to have that but the fan work guidelines wouldn't allow it:
Anything that is extracted from official Touhou Project games.
Technically, I am already breaking this with a couple sound effects (which I might change), but that feels pretty minor compared to graphics and music.
