It's one of the less recognised songs throughout Touhou since it isn't really associated with any one particular character, I'm glad you caught it, even after obscuring it further with the (I feel) unorthodox arrangement and instrumentation. I wanted to go for an acid house feel to it, but I felt I didn't properly nail it due to the lack of time and proper research into the genre. One song that I was taking a lot of reference from for this arrangement was New Order's "Vanishing Point" for their 1989 album "Technique", though as I said, no time to truly flesh the song out.
Glad you liked the artstyle too. It's one I feel strikes a good level of simplicity to feature characters that are still distinct enough but quick to draw and animate for something as small scaled as a jam.