Excellent game ! Love the mood with the music. The mechanic are pretty simple yet challenging. I loved it. My only nit picking would be with the multiple tutorial text in the beginning, since the barracks destroying goblins were mentioned right away, I was confused and though that the objective was a goblin camps that I needed to destroy. Maybe you could disable the barracks in the beginning and unlock it with a new set of tutorial text in the first level you see a goblin camp, would be a better learning curve imo.
Really good game !