One of the mini games could be a 2d, space invaders type game, but using the flying animals (I forgot what they\'re called).
Maybe a platform game, like the very, very old mario style games where you jump up to all the platforms. It would be 2d and you would have to avoid all sorts of meanies to get to the stairs that take you up to the next level of the cave. At the end of the top level would be after a little boss, would be a nice reward.