We own multiple kids games across multiple platforms and this is very unique!
The game allows players to both play different areas of the game at the same time and incorporates a split screen when they wonder apart. Excellent!! It has challenging game play but not impossible for youngsters to figure out. It also has a very pleasant soundtrack, and after suffering through game soundtracks that distract others in the room (like on barbie.com) this one was nice.
It would be nice if you could play as other characters, but my expectations are not high. For $20 or less I say go for it, great game for the kiddos.