Graphics were very appropriate to what you were doing. I thought the choice of music was a bit odd for a farming game but overall the simple audio was fine.
I did think some of the questions were a little arbitrary, I know you don't want to be too obvious, but there were definitely a couple where I thought more than one answer was appropriate, or where the 'correct' answer was perhaps a bit basic. I see youve responded to a comment like this already and its awesome you've learned something from the project :)