I found a tactic for epic level, just get those fast spawning and huge pop units, don't use titans and pick heroes the one with the swords and the lady cassandra one(fast moving) and at the start just quickly charge and attack castle, than time stop when they are starting to crowd, keep time stopping adn destroy the castle before they built up an army.
**Copy pasta** A- Keep everyone alive B- The kid gets killed C- Kill someone and then get killed by the boat D- Get killed by the submarine E- Kill the submarine