See, I think too many customization options would turn it into the Sims, but I may be wrong. I wish that there was more to do after generation 6 or so, when you have tons of money and all the upgrades. I get really bored, then give them tons of food and leave for a month. I wish there were "tasks" or things to buy that were a) Uber expensive or b)You could only unlock after a certain period of time. I also with our peeps could have "friends" that you could select, but not control that the peeps could interact with. :-)
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I'm going to take the time right now to plug my fanfics. Aspen's story and Lilihia and the Tree.