I always liked the explanation of how the game worked you got from the attendant.
"Your guns have lots of energy and when you fire them, they go VROOOOOOOM! But they lose energy the longer you fire them. So if you shoot too long, they'll only go VRM!"
Not an exact quote, but close enough.
Sub game was fun, too.
And the Bike game. I thought putting Aries in the truck was a nice touch.