Very good
I could not help but be reminded of the caveman Oogtar from the Super Mario World cartoon. I really liked how the design in this was so simplistic, but it worked really well. It is in fact different than any defense game I have ever played. You do not have any fancy guys to summon and it is taken from a different point of view. It is definitley the first game I ever played where guys coming in boats building things were actually the enemy. It is also just fun to just have that little guy swing his axe over and over.