This is amazing! You really took ALL of the cues from the official Touhou games!
I do mean it, perfectly reproduces the vibe and experience - I felt right at home!
I played on Nuclear and then Normal. The entire stage is perfect as a Stage 1!
Minor thing 1: restarting after seeing the credits bugs the gameplay, forcing me to close-reopen the game. I guess reading a staff roll fries Okuu's brain.
MInor thing 2: I did a NMNB on Nuclear. With this I have nothing more to say about the balance.