Horribly imbalanced. Some enemies are super powered. Harpies fly right past everything and do massive damage. Most units and skills don't have time to use because battles where bosses spawn right away and use super powered skills at range are lost in less than a second. There is no way to increase castle HP and defence other than upgrading the castle itself, meaning the castle has to be upgraded hundreds of levels higher than everything else to last more than two seconds. Boring gold grind game.