Stock Overflow may Ludum Dare 42 entry !

This is my Ludum Dare 42 compo entry "Stock Overflow" : https://ldjam.com/events/ludum-dare/42/stock-overflow
You are the manager of a warehouse. Your goal will be to store the arrivals of stocks but also to prepare customer orders.
Be careful not to neglect the customers too long because it will lead to your loss.
Note: The boxes with the panels must be placed in the shelves in order to prepare the orders. Each box in its color corresponding to the background of the order.
Music isn't available because I did not have enough time to compose it.
Have fun and leave me some advice on this realization in C ++ with the SFML library (Available only on windows).