...I checked one last time before bed.
Q: Can you describe the game aspect of the ride? What controls do you have at your disposal?
A: There are two ways to earn coins (the points in this game): steering and hitting enemies.
The steering part is simple, you have a steering wheel that you can turn left and right. On the AR at different points in the ride, you will see a red arrow on either the right or the left pointing in their respective directions. When it shows up, you have to turn in the correct direction and hold it until the arrow disappears. This earns you some coins.
The main way to earn coins is hitting enemies with Koopa shells. You get an item box a few times throughout the ride, and they are loaded with around 30-50 shells depending on which point in the ride you are. There are buttons on the steering wheel, and pushing either one shoots one Koopa shell. You aim by looking around, but there isn't anything like crosshairs or something so it's not easy to just hit everything. When you hit enemies, like the Koopalings or Bowser, you earn coins. The shells are colored different colors depending on which seat you're in, but they all act like green shells.
I hope that gives you a good idea.