Oh! One other observation that I wanted to offer was the learning curve on the inventory for the shop. It was pretty overwhelming initially to figure out what items were when a customer asked, as I had to search each list for the non-obvious ones. Especially as I quickly had 5 customers waiting!
If you are interested in easing the player into it, you might start with only one of each category, and then slowly add new stock. The progression would serve as not only a way to simplify the early game, but also reward progress and maintain interest.