Outrageous Orcs

Made for the Trijam in about 1 hour 31 minutes. Theme: Build and Destroy. Defend the tower from as many orcs as possible in thirty seconds. You only have enough bricks to build one wall at a time, so when you build a new one, your old one gets destroyed. Each arrow key builds a wall in that direction.  Please feel free to comment. I love hearing both high scores and constructive criticism.