In the rhythm minigame, you have to make it more forgiving;
-You should increase the time gap to hit the notes, not everyone have perfect timing.
-You should decrease the points lost for a mistake/increase the points gained from a hit. I find it stupid that you can lose all your points from just one mistake.
-There are some slight slowdown during the minigame for android that compounds the problem more but wouldn't matter that much if the above are fixed.