This is a very cute idea with crisp graphics and authentic sounds. It definitely captures the spirit of a Game Boy Color/Advance game for sure. I did find the Yuuka mode to be pretty easy; I realized after a few moments I could shit in the center and let the clocl bounce around freely and it would eventually pathfind its way to every star on the map within about 10 seconds. It was goofy; very perfectly Jam-my. Reimu's mode, however, is extremely stressful. One life and game over for a yin-yang orb which is incredibly unwieldy even before the lack of space. (I'm sure part of this is intentional in design, as the plot is about Yuuka harassing Reimu for the lulz.)
Overall, a fun game with polish and just a little jank (complimentary.)