Pretty solid
Sound effects were pretty good, game storyline was pretty solid as well, however I found the aiming to be off and regularly had to move my cross hair OFF the target to actually hit the target as the bullets would either completely miss or sail through the zombie with no damage done. Lag was another issue at major points int he game, and voice overs did not match text speed which at times was WAY too fast.
Just a few things to tighten up and a better ending and you sir, have an outstanding game.