I just thought of the idea of having the party getting separated in one of the areas and you have to play as each of the four characters individually to reunite the party
Hint to people that are going for stars but cant get all 3 stars at once, you dont have to get all the stars at once you can replay the level to get one star at a time
personally i think the final level is stupid because the bombs explode on where i need to be and the blue things kill me because i have to get close to the edge repeatedly and they spawn literally on top of me