It's not multiplayer. Try ESC / play to restart the game couple times. It's always different names and scores. I've also seen same names in different colors / scores. Pretty good AI tho, I must admit.
Suggestion for the unpractically long buying menu: Make it possible to buy a herb/potion by clicking on the producer (maybe in combination with ctrl/alt/shift/etc too). One problem to solve there would be to distinguish moving from buying. For manual selling there could be a switch (buy/sell) and use the producers as well.
Clicking the producer is not only needed to move it, but also speeds up production. I like the idea that upgrades/sells are done on the producer, but you would probably need multiple buttons on it. I will try this out a little, but it will probably be some more work and I can't promise anything. But thanks for the great idea!
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There are still more features we want to add before we remove the Beta tag, to make it a more complete game. But it will also be under constant production as well.
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I've added the Shift/Ctrl for vendors too with the newest version.