I like the game, when a track is well made the controls are satisfying & I like the energy provided by running and jumping obstacles, however the main selling point (automatically creates a track for any song you put in) the game isn't very good at:
-often the input times the game wants are delayed compared to the song, feeling unnatural & unsatisfying, you have to consciously hold back from pressing the keys on the beat
-doesn't really recognise input times for faster music in a satisfying way, most often just telling me to hold a button
-"intensity" measurement tends (for me at least) to leave a track mostly in one colour/speed, even when it feels like it should change (ie from verse -> chorus or back)
-the physical obstacles are chosen without any constraints on what animations flow well when chained, so sometimes when Melody starts a new animation she teleports, breaking the flow visually

most of these could be fixed with an easier way to manually fine-tune a track without going into the files (maybe with the generated track as a starting point), but at the moment the only songs that really work well for me are the ones provided with the game (they were tuned manually)