We thought of three main ways to play (we are trying to emphasize them better soon). You can either play alone with one character, leaving the second one on the ground. this makes it easier to control, but you can´t kill enemies (both players have to jump on them once, but not at the same time), or you try reaching the top with both players alone, achieving the best ending.
But our recommended way would be to play it with a friend, but we know that this is not possible for everybody. That´s why you can still win if only one character reaches the treetop.
But, still, thank you very much for your feedback