Interesting concept! I wanted to take my time to think about the trades, but the game sorta forced me to play "hot potato" style XD. I'm not sure if this was intentional, but the scroll wheel on the mouse also automatically makes random trades after I make the first click. I got a lot of cheese by just scrolling up XD.
Potahto already noted that the balance was a weak point in the description, but I also think adding a simple scoring graphic would help make this game more quickly understood and less button-mashy. Something like coffee > cheese > potato would be great. Then I'd know immediately I should be going for more coffees and less potato (which I didn't expect because of the devname, I thought potatoes were the most desired until I parsed out the numbers on the side lol!) I actually eat all these things daily, and thought they were healthy! Little did I know they can be considered junk foods XD! Is the green redraw icon vegetables?
I love the UI updating smoothly while playing, but as8mobius8 mentioned, once you get a lot of cheese, it's kinda hard to keep playing when you can't see the options haha. I also expected something rustic looking with "trader" in the name, but I liked the styling nonetheless!