I liked the graphics, would have liked to see a little more variation in the backdrop (but I realize time ran out) and some more interactions with the frogs (either at least not-overlaying the ingredients, or possibly even taking the ingredients temporarily or some other interaction).
Would also like to have some more feedback when buttons are pressed and ingredients added (sound effects would really help out here), and maybe an accumulating tracker for recipes discovered (a corkboard where they appear once discovered, or bookshelf, or even just a stack of text).
Interesting idea, like to see where it goes.