Ratatouille is a platformer through and through. You will have to run, jump and climb your way through fairly intricate levels in order to fulfill these missions and collect as many golden stars as possible.
While completing your objectives, you will have to keep a watchful eye out for humans, because they will be keeping one out for you. If a human happens to see you, you need to get away fast, because if they catch you, you will have to wiggle free or else be put into a jar and start from the last checkpoint. This looks like it will be a nice mechanic that should keep the game interesting since you seem to have to scurry in front of various people in order to reach your objectives.
Levels in Ratatouille are also filled with objects that you can interact with. Most objects, like wooden spoons, can be used as weapons, while others are used to get to hard to reach places like wire tight-ropes and brooms or springboard anchovy cans.