Brilliant!
It was great, really superb. The physics engine was an outstanding achievement by itself, and that combined with a huge array of weapons, powers, skins and modes made it fun for at least an hour, and i keep coming back.
For an update or a sequal i'd recommend some Guns. Kind of like the game "Madness". Also a more realistic body shape (by that i mean arms & legs, not meatballs) would be very cool. And the final thing i can think of is like, more sound effects and things you can do to encourage your buddy to like you!
Overall A Great Game!
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Oh and for everyone wondering how to make the buddy smile, use your "Open Hand" and help him up after he has been knocked over by an explosion :o)