My issue with this progression system is that when you replay a song on the same difficulty, you won't earn that many points, unless you greatly beat your previous score. (otakudome.com)
A few other things about the game that I really like is it saves your progress, and after you beat the game you can replay it to try and beat your previous scores for each level. (pocketberry.com)
Quick play which is aptly titled allows you to choose one of the 14 events for those quick gaming sessions that give the player an aim to beat their previous scores. (impulsegamer.com)