UniBall is a free 2D online multiplayer game. In its most popular game mode, Hockey, players are given ships that can move, boost (move faster) for short distances, and shoot and receive balls. Players on opposing teams compete to be the first to score enough points to win the game.

It's kind of a space hockey/soccer..
You've ladder youve squads(clans) u've own game chat client and a lot of leagues and cups.. the game is pretty simple but has lot of competivity and tactics and its pretty addicting

http://www.uniballhq.com

on the chat theres a room for starcraft player type /join Starcraft

(the flashing in the video isn't on the actual game, it just happened with the recording software)