Sorry. IT'S TOO HARD – Song of Hero : Music RPG Review

Why is this game 4+? I mean the music is too hard. 4 year olds would never be able to play this. But some times it's not. I just expected it to be a lot more fun instead of tough. So please explain to me, why did you rate this game that and please, make some levels for the songs like EASY or MEDIUM. Thanks.
Review by PGBOP on Song of Hero : Music RPG.