Thanks for your interest to our project!
Actually, we don't limit game space. Both the settlement zone (highlighted on the map) and the borders of the game map itself will constantly expand with new automatically generated rooms. We have temporarily limited the private free Early Preview mode due to server capacity limitations for computing players' scripts, and this limitation has more to do with players' activity than their quantity. It is only after the launch that we'll be able to give more details about when we'll start inviting those who did not participate in our Indiegogo campaign …