Great idea!

A few others:

Gotta have the Yo-ho-ho song from the ride in the game someplace. Maybe high scores? End of game? Attract mode?

The game has a camera? How about photos of players who get high-scores but use the facial recognition tech to add in mustaches, hats, or whatever distinctions the character they picked has.

Since the camera is using some sort of head tracking, how about a mode where the lanes light up based on where you are looking or leaning and you have to lean/look and shot at the same time to make the shots. Could be called "Choose Your Destiny" or something like that...

Some great ideas in this post.

The more realistic the swaying of the boat looks the better. It's the primary toy on the game and needs to exceed our expectations.

But it also needs amazing sound effects to complete the illusion. When a ball is on the black pearl the sound effects should make the player feel like they're really on a creaking, hulking, floating wooden fortress! - There should be lots of sub bass rattling the glass too