I love Kart games, and I love touhou. This seems like a great combination.
For working on your own for 2-3 months, this is an excellent job. I have some game programming knowledge, but I never got to the 3D game programming, only 2D ones.
I never knew ZUN had policies... I guess the Touhou Pong game I made would get me in trouble. I had to make it in a month(I actually had a month and a half though because I got swim flu and had to take off that semester. My school had 1 month semesters) And I had no time to make my own assets, so I kinda ripped everything from 12.3
I had a lot of plans for that game that I wasn't able to get into it though. Maybe one day...
Anyway, your game. Looks really fun. You have a lot of really cool details, like the Sakuya tree's swaying in the wind and stuff. It seems drift boosting gives a really long boost though.
Question, not sure how much help I could be, but if I wanted to try and make music(which I really haven't done much of, only slight work in college), what would be a good program to use? And what Program are you using? What Coding Language?
Also, you have Tewi, my favorite touhou, in this game. You are awesome.