My success came from running;
Goblin, Goblin, Stone Golem, Healer, Goblin, Goblin, Goblin, Goblin, Stone Golem, Healer, Goblin, Goblin.
The best thing about this is when your monsters slowly get killed in the front, all of the buffs are still over your troops. In the last level, just make sure to always stun the bog tower, and place one quake right on top of the middle nuke tower. The radius may say you can't hit all 3 of them, but trust me, you can.
Well, i'm happy that you can eat the hamburger and still get the best ending, so at least accidentally eating it doesn't ruin your whole game. Just make sure you're promoted though, it's a hell of a lot easier if you can order the most expensive meal.