Just came across this quite interesting article on Zoo Story. Seems that TeamLava are deliberately making this game a bit more convoluted than its rival's versions. In my opinion that's a good thing; I think it's nice that this game is going to require more attention than just a desultory two minutes of effort. Should also mean that it holds one's attention longer. Sounds promising.
https://www.insidemobileapps.com/2011...a-week-or-two/