I love this
I was playing on easy, and I forgot there was a difficulty option in the beginning. My score was around 3000, and I hadn't been hit. I also had well over 800 rounds for my automatic rifle, and around 300 for my shotgun. I was going to complain about how the ammo drops too much, how the zombies were too slow, and how it was overall too easy. Then I remembered there was a difficulty selection screen at the begining. I played on hard, and the game had every element that I was going to complain about being missing. Great job. This is a great game.