I love the idea! The music selection is also *chefs kiss* as an anime fan and rhythm game player. The only thing is that the desired scale is hard to see ahead of time and change, wish there was a more defined way to see it coming so I can ace it :D
Thank you for the compliment :) We will attempt to adjust the speed and speed up options, and add serverial modes, like 1 or 2 -direction modes as the Easier Modes. Stay tuned! :D