You seem to have gotten a lot of downvotes here, so let me see if I can comment my views instead of contributing to the spam. While this would be a way to create an end goal to the game, it seems forced, and largely unnecessary. The whole point of this game is to keep expanding, and it's a big part of what makes the game fun, but some arbitrary score system doesn't seem to improve on that. Honestly, rather than being an incentive to keep expanding, I think that score system would make me more likely to stop playing the game just because of the way it sounds. I won't say that this isn't a valid option, but I don't think it's necessary and I doubt CoffeeStain is going to create a system like this.