Thank you so much for trying it out!
I definitely should have added more difficulty levels to the game. If you wanted to try it out with less-experienced players, there are some game parameters that you can adjust in the game Settings menu (the gear icon in the lower right) -- such as raising the limit of grapes that are allowed to be stolen from 4 up to 10 or 20.
Regardless, thank you very much for your detailed and thoughtful feedback -- I do appreciate it!
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That had been good thing to realize that there was difficulty level. Could have switched it to 20 to learn first, then down to 4, since I think the low number is basically better, but at beginning, when playing with just 2, it can be bit frustrating to get to game over all the time. With 10, or especially 20, it gives you possibility to learn defending in much more peace.