Just realize how the soldiers would be scared; An unstopable force of men crawling at you, without guns nor emotions, unable to feel pain and having no other goal in life than to kill you. Just imagine the blanks stares coming up to you, ready to enslave you to death's grasp if you look away for one second. The worst of all, they won't stop coming. They won't stop going up against you, even when you kill them. They will still walk the scarred earth, trying to find yet another soul to kill and convert to their masses. They are the bodies of thousands, all of them dead throughout the war, and they won't stop coming until every one of them is down.
The game is incredible in how it gives me that hollow feeling... Like there really isn't anything to live or anything at all. That you are completely alone in the world and this is the only thing you c an actually do. Just one robot in the whole world, doing the only thing it can. The concept just directly makes me thing that. Just incredible.
I also love the upgrade system, mainly because this is the first game where you have to have to adjust and tweak every single attribute, lowering it and highering it so it fits to your preferences just right. A simble yet addicting game it is.