The only complaint I can see right off the bat is the picking your quest/ sending off heroes. To send out the heroes I find that as more and more places that are unlocked I find it more and more tiresome to get to the quest I want/need for my store. Personally I make it more of a list with the item in easy view to pick from with maybe the quest name on the bar and the icon that is there on the one or the other side to provide an easy clean look with good fashion. to cut down on the time i haft to go back in the stack of places to go. Just a though ;D
 "Shop Heroes"){kind=icon}
Looking into UI improvements around this.