If you're playing as 1 player, then click Z and X to get big and get small, and the arrows to move. If you click "2 Player Mode", and you are the 2nd character, then you need to click W, A, S, and D to move, E to get bigger, and R to shrink.
I used a ton of thinking. That's all I did. I took a while making the "2 Player Mode" thing.
