If you know how to play it's not as hard as you think. I always start with a sniper tower then fully upgrade it. then I buy all towers(exept flamethrower) and fully upgrade them. but I'llby them one by one and fully upgrade before I buy another. the two buffing towers help a lot to.
CoT5 IS IMPOSSIBLE! the goblin just phazes through allof my troops, and kills me before I can kill him, even with all my troops completly maxed out, the strength skill card active, invincibility, and all my troops upgraded! wtf?!