Beautiful art and really cool concept. I had a real "wow" moment when I understand the core game loop of building. Unfortunately, I had a lot of trouble with the controls. The grab mechanic was really unreliable. I couldn't tell if only certain types of nails were grabbable? And your difficulty disclaimer wasn't a lie lol. If I thought controls had a learning curve, that was multiplied when the camera began to move drastically. The game could definitely use an easier mode or tutorial before getting into it. It also wasn't apparent how your building affects the fight in the background.
Great job on this. The game looks and sounds great and that's a huge achievement in just two days. Well done!