Lengthen those dudes a bit so they have an chestpiece, pauldrons and arms.
Dragon should take considerably longer to build and have lesser rof. Swordsman needs to deal lesser dmg to building, Catapult obsolete in any way possible by Swordsman-Dragon combo.
Ive rushed AI with 2 dragon 12 footman and gg
. Also AI is crap(but where isnt? ^^). Production structures and main building should have bigger size. Ranged units crazy weak needs buffing.
You are using a single resource at the moment, try to get some sort of "wood" in.
You may want to seperate caster and healer functions, presuming you will add more spells in the future should have Mage and Cleric. Mages generally useless outside of healing, you can totally live without that aoe dmg shot.
Try getting wall building in the game. Implement an upgrade for housing, base area fills up with them.