I think it would be cool to add a new game mode that makes things a bit more challenging. In this game mode the game starts with a tribe of animals (maybe around 5 or so). Things are peaceful for a short time and then the earth starts shaking. The island you are living on is slowly falling apart. Your tribe needs to reach the next island exit as fast as possible! And this is how it keeps being from now on. Every island you enter will fall apart after some time, so run for your lives!