While part of that game is the typical user experience of going through the narrative of the movie, another part features a toy box where players can collect and play with different toys in a more free-form environment.
After all, successfully mixing pyrotechnics and narrative is how the most satisfying genre features of recent years -- such as Peter Jackson's "Lord Of The Rings" trilogy and Christopher Nolan's "The Dark Knight" -- have found artistic, as well as commercial, favor.