Music wise we will see, but in my opinion the entire point of a demo is first impressions. The Octopath demo was chock full of amazing music that all made it into the final game. Several amazing town themes, battle themes, and even character themes. Granted comparing it to soundtracks like Octopath is a bit unfair, because not many games have soundtracks that great period.
I do want to fill out the survey because I think the difficulty needs tweaking. Right now the demo feels too difficult/punishing for a newer player. So I'd say either tweak the difficulty or allow the player to grind out levels in random battles to even the odds to their liking.