you didnt do anything wrong. I just want to give a few small suggestions.
1, A music lock feature, so if you find a song you like, you lock it so it doesn't change.
2, Custom controlls. So you can make a control layout (or just add an option to switch the circle pad and D pad for option 2)
3,Multiple saves, so when someone wants to play 3D Parkour who cant (Doesnt have a DS for example)