Anybody played this? Teeworlds (formerly Teewars) is a 2D platformer shooter where you play as a dude that looks like Kirby but with sweet sweet firearms. You can double-jump to get around but you also have a sweet Bionic Commando-style grappling hook that can pull you toward walls or prevent other players from getting away from you. Combat includes capture the flag and team deathmatch with up to 16 players online.
I grabbed it after I installed Xubuntu on an older PC of mine and its a real hoot and runs great. I got a bit tired of playing on servers in Europe, so I set up a little server of my own (based out of the Seattle area). If anyone wants to play, there's always a person or two in the server so hop on in.