Barnaby can swim

The theme was "running out of space", and my idea was that Barnaby couldn't swim, so as the beavers stole the logs, he would run out of space.

The problem is, the beavers die if they touch Barnaby, and avoid him if he's nearer than their goal. This means they can't steal the last log, because Barnaby is standing on it - hence you can't lose the game!