It's true, level 5 is very hard. However, with luck you can make do with wind as a primary power source with the ever trusty nuclear backing it up. Farms won't be important till day 3, and get a mine up on the second day at the northern side. Notice that the northern side is zombie free.
I finished it. You can also take out stealth tanks without EMPs, because their bullet's aren't cloaked, so you can shoot where the bullet's are coming from and the cloak wears off. Just use a lotta missles on the cormorant.
this game show how is dramatic the farming in modern time . very often happen that is much more profitable to let the good waste on the lands then arvest it . think about it