This games feels like being in an abusive relationship and should probably come with a trigger warning.
I'm not sure if that is criticism or praise to the creators.
Loving the game - to anyone struggling you may find it easier to listen and anticipate the beat rather than just rely on the visual cues. Once you know the early section of an x level well enough (due to repeatedly failing one of the later bits, it happens to everyone) it's actually quite possible to do it with your eyes closed.
I just wish there was some way to practice later sections of x levels without having to repeatedly go through the first 16 bars again and again and again...
Graphs/charts are on the to-do list!