Not sure if it's really my place to say anything, since I'm not affiliated with this project, but I think the song sounds wonderful and will no doubt be stuck in my head for a few days now. A few things I would change, though. The drums seem a little jarring at times, and you might want to quiet them down a bit. The dynamic range is rather large compared to a Touhou song (not really a complaint, but it stands out). I'd also suggest bringing out parts of the background (Really not sure what it's called. The counter-melody sort of "beneath" the main one).
In any case, excellent work.