Quick note - After playing some of the higher levels with my wife, I can say that the game definitely does scale up for two players. This made it a little more challenging. A few of the motion controls become jumbled in all the chaos, but overall, it's still a good time.
While on the forums I type hard and fast. Please don't hold my typos against me. I'm trying to use my meager powers for good. If my advice gets you killed, I apologize in advance.