Well, i finally did it. Yes, you are right, building farms helps a lot. The big problem is electricity, it's for me the only problem in this game. I need at least 700k+ to win my games, i got the same problem for mission 7.
Under 700k, turrets fire 2-3 times and they're out of energy. With thumpers, pheromones and tesla towers, my god all of these tritium reactors and solar panels are useless...
Batteries helps, but they can't reload enough energy to continue firing for all of these DAMN ALIENS :p Really, i enjoy this game, it's super fun. It's the only disadvantage for me.
Also, i see in the video that farms aren't the same as mines, i got the brown ones. Is there a difference ?
P.S: It's also frustrating when a sandstorm appears when the final wave come.... XD