Everything costs too much, and ravens cost way too little with their auto turret ability. I made nothing but ravens, after I learned everything else sucks, and won this, but didn't get far when I played trying to not build ravens. Also I noticed a bug where if your sensor tower dies you don't lose the game. I had 1 thor left somehow after the nuke dropped, probably because of the unit placement error, and I was able to make 7 ravens before the next wave and run them away and come back to win the game by setting up turrets from the outside in, and some seeker missle pulls. It was rediculous. Would be fun with more people though but ravens need something changed heh. Like an insane cost or everything else cheap enough to keep up.

Raven definately are very powerful as is, but I don't know if i could have won without the BC and viking near the end. Some levels are pretty badass. Broooooodlords!

Won on 2nd try, so I'd say it's hard but doable, but I did use ravens a lot, i'm sure if i tried to hold all on ground i'd get crushed.

to let you know sometimes you can cheat the ending sequence and some of your guys will still be alive. you should have to explosions. First one should destroy everything including buildings then the next should wipe everything else that was in buildings out