Hmmm, only suggestion I can think of is an option to buy multiple things at a time (though that's only a minor inconvenience at worst), and perhaps the ability to participate in optional side jobs, so one could try to get the money to afford all/more of those wonderful toys in the shop.
But over all, well done. A 5 Star game, can't wait for chapter 2.
 "World's End Chapter 1"){kind=icon}