Oh my goodness! I need to give a heads up this is going to be a very long comment!
This, was, brilliant! The interface was easy to use, the references were great.
Some suggestions for future levels either for you, or Zoe, perhaps both alternating again!
Hot chocolate
Warm cookies with various toppings chocolate, sinimon maybe?
Then for even bigger expansions:
Following up on customers where you don't have the order. You could get coins for successful orders and then buy recipes in, so for the person who wanted that decaf she could come back later and you could surprise her!
Customers commenting on how their order is, if you got it perfect, if it's a bit overheated but if you try again and get it right next time they might like you, or some might storm out or give less or such.
So you could get some achievements for that.