There isn't much to do in this game. It is really fun to watch the simulation running. I can see how this type of game being fun if the simulation was more complex, you had more control over it, and you were given a list of goals you have to try and retch so you have to try and create different conditions by controlling the simulation with your limited tool set (a sort of puzzle game). For example, in this game you can have a task to end the game by running out of rabbits, a task for ending the game by running out of grass, a task for killing X rabbits using foxes, and a task for getting x point, etc.