I think the best choice for big ships and metal ships is disc launcher,you need to upgrade fire rate full to 5 and some health and damage.Notice:you will need a good mouse and strong finger to click over and over again but it will work :D
Titan units are cool but I think the angel should have the color like goden or silver or white,pink with little purple maybe too girly I think and I agree with others,you should add scroll on the minimap for easier and faster tactic. The last I think the best way to beat epic levels is max mana and max shield,you just need to boost shield in battles then heroes and titan units will do the rest.Cool game 5/5
 "Monster Slayers"){kind=icon}
 "Age of Defense"){kind=icon}
 "Heir"){kind=icon}
 "StormWinds: The Lost Campaigns"){kind=icon}
 "Epic War 4"){kind=icon}