420 points.
Very clever game with good game idea and working game play. I were missing the other customers and the mother walking around. This could be having more shops as in different levels. This could be working on mobile devices too, if you implement the walking by touching, or even by virtual joystick.
This is kind of memory game at the same time; which item was where in the shelves, and to remember what your tutor wants to you to bring her. I did not realize first you can move you cart, but it's was a one clever thing to use too. I was hoping it has some more functional feature to the game; like if mom would place the orders according of the some kind of the shopping list, the items shall be picked by in some categories and the moving cart would help.
This would be awesome with exported into a supermarket and some 3d-graphics included too! Good game concept; good to you work with it!