Killing someone carries a certain weight when it's forced upon you. Most action games condition us to want to disarm, dismember, and disembowel anyone who dares get between our blade and the next checkpoint. Walking a different path, I Am Alive makes killing mean something by questioning the necessity of each violent act. Self-defense is paramount to survival, so when someone dies by your hand you wonder if it absolutely had to happen. People -- not necessarily enemies -- are better avoided than engaged.