Eets: Hunger. It's emotional.
In each level you get a selection of items you can place to affect where Eets goes, since you can't control him directly, all of which are explained with tutorial levels along the way. The items are wide and varied, such as marshmallows that affect Eets' mood and change his reactions accordingly, whales that fire anything they eat into the air, wagons that carry items around or destroy the landscape, and plenty more. Levels also have various obstacles and enemies that have to be circumvented, growing harder as the player progresses.
Players can also gain trophies for finishing levels without using all the items available or for how many certain items they've used. There's also a level editor and a replay recorder, both of which can be shared online with friends or through the Eets site.