This balances the books quite nicely. After all, Gensoukoumuten has always done the very best of the heavier Touhou stories. Maybe he just wanted a little change of pace?
I have looked at this image on three separate occasions so far, and each time, I have noticed an additional mini-Suika that I had overlooked previously, being even more adorable than the one before it. I'm beginning to think there may be magic involved here.