Interesting concept, and nice menu screen :) The game controls pretty well and you get a feel for how to open the player's mouth correctly pretty quickly. I think it would be cool if it played a ding noise or something if you successfully eat all of the foods that fall from one container in a row.
As for bugs, I noticed that a couple times one of the foods from the previous contrianer drop would fall as the first food when it drops again. i.e., cheese then ducks, there would be a bunch of cheese that falls, then some other thing elsewhere, then one more cheese then the ducks fall.