I partially agree with other commenters, replacing those customer placeholders with something more graphically fitting rest of the visuals would be nice, together with a thought bubble/balloon or other indicator what each person wants to buy and how much money they have. The speed of them coming is not such a big issue since you added buttons to slow down customer wave, which is nice. In my opinion there doesn't need to be any mechanic to spend money, but e.g. some goal how much you should earn during a wave of customers, and limit number of inventory items each day (like you only have 10 strawberries daily etc.) would make it more challenging. Right now I basically watched how "people" come through my fruit stand without doing basically anything on my side 😅