This reminds me of some of those games from the Flash era, where the character tries to go farther and farther via upgrades. I like the concept, especially when coupled with the writing of Reimu being a gremlin to get her items.
Even if the music seemed to be on a short loop, I liked how dynamic it was depending on speed. The visuals add a silly detail to the game as well. The progression isn't too challenging and seems almost trivial, but that worked well for a short game.
Well done on this one!