After completing a level you will see how many stars and points you got.
Overview: You can see how many points and stars you earned. When you play better you get more points. Read here how the score is calculated.
Leaderboards: Compare your results against other players. Click and see where you are ranking against other players.
Statistics: From statistic you see how accurate was your timing. You can take notes if you need to improve our timing.
Play history: This shows your history with this song. Higher bar means higher scores. It also shows how many times have you played this song.