Art is nice, controls are nice, sound is nice — I really like the interaction with the customers and the dialogues we have.
Maybe you could add some particle effects when you complete a product.
Also, a little talking sound when someone comes in and talks — just some "blbdjflakdfl" noise, nothing literal.
And if you really want to make it perfect, probably some extra sound effects too!
Just to give you something to think about: the layout could maybe be improved. It looks good, but I think there might be a better way. For example, you could keep the top and left parts on one screen, and move the right part to another screen. Then you could switch between a front view and a back view, where you could also create a different ambience by using sound. (This is just an idea, maybe it’s even worse, so take it with a grain of salt.)
Overall, just a really good game — it reminds me of the old days when I used to play games online in the browser.