I don't understand why the reinforcement comments are getting downvoted. There ARE reinforcements, and they ARE placed by the computer (and usually in bad places.) Take a look at your territories when you end your turn, you'll notice some of them grow new dice.
There ARE INSTRUCTIONS at the difficulty select screen, but the button is just plain text colored the same as the background. In addition, it's misspelled as 'isntructions'.
Tending farms should give 2 food. As it is, the farmer produces only 1, which is just enough to feed himself for the day. He might as well not be in the town.