Arrow keys to move. Click vegetation to eat it and grow larger. The goal: get as big as possible and eat the world! When all the vegetation in your habitat has been eaten, press space. When you've eaten all the food in Australia, press a. When you've eaten all the food in the world, press b.
All credit to Paul for thinking of the both brilliant and ridiculous idea of a game with a very fat kangaroo. Eventually I will probably update it so you have an inventory, and the more you eat the larger it will be. Also there will be tribes of other, little kangaroos.