Finally played some multiplayer last night. Playing together on the same screen is fun, but also kind of fucked up. It can mess up your jumps if you're trying to get to a platform that someone else is already standing on, or you might get in the way of a power-up. Can you not throw your partner(s) upwards? I kept messing around with that, and sometimes was able to throw the other player at an enemy and kill it, but often would kill/de-power my partner instead.