Well it took me awhile but I figured out how to beat Survival after a bit, and therefore every other level once you have the right blocks. All you need access to is Dual (D) Boost (B) Piercing (P) and Eye (E) and this set-up.
D--PP--P
D--PP--P
E--PE--P
D--PP--P
D--BP--P
Piercing facing logically, you just have to play keep-up with the bosses, but can let the blocks finish them once they're down to 80hp (60 in Gluttony's case). Replace any cheese'd or Wrath'd towers and you're set to go. You guys should probably bump this to help others out.
I use a warrior for attack and walling, a cleric for healing and extra walling, mage for heavy ranged damage, and a rouge for archery because of his poisoncraft. the rouge and mage are behind the warrior and cleric.
Oh, and head to the bottom left hand corner when it asks you about your quest in the beginning to change which quest you take.
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