I know a thing or two about music, I'm no stranger to rhythm games, and I even know a little about the challenges with making a good rhythm game (such as screen refresh rates, audio sync challenges, etc.). I must applaud your bold decision to make a rhythm game in the vein of Crypt of the Necrodancer! The art is cute and lively, the music is fun and fitting, and the core mechanic is pretty unique.
I do have some problems with the design, though. The metronome you have going in the top-left is just a bit out of sync with the music, so I found myself focusing exclusively on that part of the screen instead of rocking out to the fun jams and enjoying the art. I also am not a fan of the isometric design since the game is based on 4-directional movement. Another thing I would want to see improved is the layout: rather than moving just a little with each correct movement, move a whole square. It would make progress feel less plodding. I quit after 2 levels because I just wasn't enjoying it enough.
To summarize: I enjoyed the innovative ideas and the visual/audio design, but it needs some refining.