Very good.
If this ever gets revived, or a remake gets made, i have a few suggestions on how to improve it.
Make it an open world rythym game, you are able to craft more than one guitar that gives you stat boosts during battles, the guitars would come in various tiers from "EPIC" to "LEGENDARY" i think this would genuinely impact the enjoyment of the game and give it more replay value.
Also make the story more mature, make the characters swear all the time to show you are commited to the vision of the new direction you are steering the series to, and last but not least, UNREAL ENGINE 5. Yea you best believe it would sell TRILLIONS of copies.