Should have the option of speeding things up. Clicking on customers should also give you their preferences in certain shops. To make the game less repetitive, maybe special events now and then would be nice. To make things more complex, should have other shopper-related issues such as security, cleaniness, advertise the mall etc.
This game reminds me of one old browser game: Utopia. Even the races are familiar... In any case, this game does appear to be somewhat sluggish or choppy.