You're an ice-cream seller and you have to sell Ice cream to earn points. (You can buy your ice cream inventory at the ice cream warehouse) With those points, you can buy better and more expensive ice cream. Press the arrow and visit the different worlds. In each world, a person will buy different ice cream. You start out with one point.
I made this all by myself. This project was a submission to a tech fair. Edit: There is some room at the home screen for a new kind of store. Please Leave suggestions in the comments.