Whichever animal player 1 chooses, the opposite animal player 2 will get. For example: if player 1 chooses dog, player 2 will get the cat. Player 1 controls (the cat) : all arrow keys except down. Player 2 controls (the dog) : a, w, and d (a and d for moving and w for jumping.) The dog will always be player 2 so if player 1 chooses dog, he or she will become player 2. Sorry. Plus click the other animal to begin at the part where player 1 chooses their animal.
Still working to make it better! The song is called Warriors by Imagine Dragons. I am such a huge fan!