The touhou themes could've been blended a bit better.
comeonandslam here, and yeah, you're right.
Some songs you get lucky and the line structure matches pretty well from the start, so you don't have to do much more than sync up the tempo. But long bridges and stuff like that, all of which feature heavily in Touhou songs, are really problematic for me. ikusat is a bit better about moving pieces of Space Jam around to fit the underlying song's verse structure.