"Maybe it wouldn't have been if I'd gone through the tutorial instead of picking up from my friend's game save?"
As far as I know this is not explained anywhere in the game itself. Coming from DDR I finally twigged that something was up when I did a full combo and realized I was still light years from the #1 score, and realized there must be more to it than that. Obvious in hindsight, but easy to miss. And I would not have guessed how much it wants your swing to be rather large; scoring [1] is 70 points for a 100 degree approach, 30 points for a 60 degree follow through, and 15 points based on accuracy in hitting the center. Nice in the sense that it creates a lot of headroom for high scores, but most people should not obsess over score too much. The swing sizes it "wants" get absurd pretty quickly as the boxes start coming faster.
As far as I know this is not explained anywhere in the game itself. Coming from DDR I finally twigged that something was up when I did a full combo and realized I was still light years from the #1 score, and realized there must be more to it than that. Obvious in hindsight, but easy to miss. And I would not have guessed how much it wants your swing to be rather large; scoring [1] is 70 points for a 100 degree approach, 30 points for a 60 degree follow through, and 15 points based on accuracy in hitting the center. Nice in the sense that it creates a lot of headroom for high scores, but most people should not obsess over score too much. The swing sizes it "wants" get absurd pretty quickly as the boxes start coming faster.
[1]: https://bsmg.wiki/ranking-guide.html#scoring