i made it to play all missions in "Obliterate Everything" so i want to tell you some tipps because its not one of the easy games ^^
I saw that most people dont know how to win Stage 2-2, here my strategy: -build two "fusion cores" in the left bottom corner -defend your head quarter with a circle of "autoguns" arround it (those three-barrel guns) -let your "thor missles" destroy the enemy base
Another very difficult mission is Stage 3-5 (actually the final lvl) here my strategy: -build only one "fusion core" -build two ore three "supply docks" in the right top corner -defend your buildings with a great ammount of "laser". These little towers will produce little zombie-rockets AND defend your biuldings against this **** "thor missle" of your enemy. You will have to rebuild these little towers very often so keep an eye on it. Your should have enouth supplies to do this.
I hope this little tutorial will help some people to play all lvls of this great game, the very last mission will reward your work