The gameplay could need a bit of improvement. If I pressed a key it was often unclear if I would just skip the customer or not. They approach with one item then the bartering occurs on another one...
Instead of just entering a number it would be nice if there were a few options to chose from, like "+1", "+5", "+10", "+25%", "what the customer's asking"...
And if I haggled to the end the next customer(s) often would ask that amount and as their final offer.
Won/Game Over screen needs a quit option for a standalone build.