I recently bought the game, and I figured I can provide some feedback.
- I might be in the minority to want boy idols as some groups have them irl. I don't know how integration works, but I consider maybe making it an unlocked feature if one idol happens to have a boyfriend. You can probably make them a singing duet depending on if the boyfriend has any talent or not. It might be interesting how that feature plays out.
Okay, minor nitpick aside, I honestly like the variety of genres you can make in this game. My favorite genres happen to be R&B and Enka, but I like how you can do research on all of them. It's a nice touch.