Turning an auto clicker on for this was pretty amusing. Other than that targeting seemed off and I had to click early to get the desired results, those knives do not fly straight
Guide for all the normal epic levels: Just have time fully upgraded with all titans equipped (upgrade optional), I have gobs and pixies for the remaining two slots for stalling. Just hold off until your titans get out, once they get to the enemy base stop time. Try to time your spells so they link with little enemy movement as possible. You should be able to destroy the enemy castle like this without ever having to fight the Calvary of the enemy.
Don't even bother with mega towers or anything.
Get a good maze going, well placed maxed area burst with maxed range and rate touching it. Add in some slows if you want or work towards another area burst tower.
All you need to worry about is ghosts if there are any