Excellent pass-time!
There are updates to earn, different kinds of customers ... etc. The graphics are kind of "different", they're fun I think.
Oh and I almost forgot - the reason why Lewis took this job in the first place, is to be able to afford medicine for his sick hamster (!). I'm not entirely sure I see the point of that being added to the "storyline", but why not! I found Shopmania to be entertaining! It's a nice way to pass some time, and to work out your coordination.. ;-)