for anyone that needs help getting gold early on in the game, after you liberated the 2nd island just go to the first island buy all the rice you can hold and then sell it at the second island for profit and repeat.
sadly the real story of king midas is that he wished that anything he touched would turn to gold so he could forever be rich, then when he touched his wife as a kiss she turned to gold and he learned the valuable lesson "careful whatcha wish for!"
quick guide to beat the giant on level 10! send your fastest units out first so they get to him before get gets to the half way point between the castles. once there is a unit near him he will raise his giant axe for about 7 seconds before bringing it crashing down causing a bunch of rocks to come out of the ground a long way in front of him. Shoot him when his ax is up because his weak belly is exposed! after he attacks he will take off his helmet and wipe his forehead, apparently that attack is exhausting if your quick enough you can shoot him a few times in the head to get critical hits. dont waste your powerful spells trying to attack him when hes moving they bounce off of him. +this to keep it alive!