first of all wait a few second for the enemy to spawn a few units then meteor them this gives you enough gold to purchase the egg o matic he will take on a single club man on easy or hardened without assistance. you will need to spawn a clubman for incoming squads or slingshots to avoid damage. once your meteor cooldown has come about, you are able to use it concecitivly two more times when your on your forth meteor in total, save it up untiln the enemy spawns two or more dino riders, he may send an extra one or two, your egg o matic + afew club men should take care of him. if you have sufficiant funds, purchase a second turret slot and another egg o matic. you should be able to advance ages quite soon after this. once you do its a similar deal, fence them off close to base with a few sword men untiln the next age. dont worry about another turret during this age. next age, you should sell one of your egg o matics and replace it with a large cannon. once again, fence them off close to base with a few duelers. when you reach the modern age, save up for a double turret gun, they absolutly dominate, once you accumulate 4 of them, you will not need to worry about spawning any more units untiln the very last age. once you reach this age, save up 750,000 gold and purchase 3 super soldiers. game over.
It's actually possible to beat this game in the medieval age, by using the repeated tactic of melee + 2/3 ranged and whittling the enemy's HP down little by little.