have these characters made of their world" is as easy as anything.
same as "explore"! "have the characters explored their world more than they had when we started? how much more?"
do you know the game eat poop you cat?
i know this is not part of the question but is it even fair to say that ?find out what these characters will make of their world? is the object of the game?
i would say "no". it's as vague as to say that the object of the game is to have fun. it's something missing in vincent's goal, because having a object like that is like pushing the responsibility to make the game 