The Hand of God
First I'll just regurgitate what others have said: fun concept, nice level progression, could use more enemies. Now I have to say that I'm really looking forward to the final release because I can't wait for those craftsmen and wizards. That just might mean there are more types of enemies, eh? Keep the gamer interested by opening up new features because I'm on Stage 18 now, my hand hurts, and there's no reason for me to continue playing except to get to the next level. More enemies, more castle upgrades (moats, warriors, catapults, etc), more incentive to keep playing. Great start!