Thanks for the feedback!
We did discuss alot about the movement speed. The main reason is that if you were faster than the zombies, you'd just run around and there wouldn't be any feeling of danger for the story. That would do just fine if the game were a shoot-em-up but we have a story driven game where you need to answer the phone instead. Now the player is just about the same speed and you have limited things you can do to hinder the zombies movement (hitting them, blocking with benches or cars at certain choke points and going around corners).