Good idea and its relevance to the theme. I also liked the sounds that could be heard between the metal phone and the speakers before :).
It would be good to have a highlight of the buyer's product selection, because the product blends into the background and I didn't pay attention to it at all the first times. It would also be good to have a beginner's level tutorial, if it showed you how everything works here.
Cool graphics!
Good game, congratulations!