its good to have a enemy marker like an arrow on the side of the screen or around the tank so you don't have to search the small enemy to clear the area. + if you agree
build the artillery. update all the resource to max then attack the enemy . when the flagship hide forfeit. build the fleet when the flagship reach the artillery firing range hold up. and bingo you win + if you agree :)
stop building fleet if the boos is coming. get the boss and his fleet not in invisible place and build all variant of your fleet. note : factory is not to helping your fleet creation time.