Expected more
I thought with such a large scale in the final will be something special, but there is an ordinary break through the horde. And this unfortunate ladder... If it was a Left4Dust campaign I would have understood. You do the elements of horror but you do not even added a witch, for example down there after that hapless ladder. So for me the final ruined everything. It's so boring to break through the crowd in solo, even with the hunters and jockeys. I would do something unexpected like fall into a dark room with a tank, well and put there a couple of columns to help run away from it. Well, I respect your work at almost 1GB (Yama are smaller), although in my opinion your attempts at this stage to make from L4D something like "Dead Space" or "Bioshock" failed.
Mars landing on infected Earth