Yes, it could be similar. It could be made like in
the first 3D City Game, but where I make the zones rather than letting everyone expand their zones as they want, and city builders have to achieve certain goals before they may build beyond a certain height or claim a new zone.
I don't want to force anyone to build lots of 15 · 15 houses along 2m wide pavements along 8m wide roads, though.
People will be mostly free to build their own cities, and as long as they stay within their borders, they can't destroy other people's cities anyways.
And there won't be any production, industry, population etc., as it can't be calculated easily. It could be rated, but I don't think it's good to set games up around subjective ratings.
Of course, I will make zones around zones which people expand into.