Absolutely, remember that you don't need to make a super expansive world to win, a small scoped, well focused, and polished design is far more likely to get you a high score, then a half complete expansive concept.So...anyone is allowed to participate? I've never worked with a team before, but I'm not sure I can make a game in seven days alone.
There is no sign up deadline, so long as you give us a game in the competition thread, it will be judged. However we do like knowing how many entrants to expect, so posting here is a good idea, as well posting is likely to net you the participation points.Could you specify when the signup deadline is (if any)?