Have a look! There are two teams -- Heat and Chill. Heat has red and orange cars, and Chill has blue and cyan cars. Team mates can't set off each other's weak spots, and since scoring tends to be much more rapid, KOs are each only 1 point (for now -- we'll see how that goes as I test it with other mutators). This mode will be introduced with the next Open Alpha, 0.3.5, which I intend to release this week if exams don't keep me too busy.
A premium account is a KarBOOM account that can be used in the game to play with others online.