Thanks for the feedback!
We had an issue where Git corrupted our game the day before the deadline, resulting in us having to go back to a previous version and losing quite a bit of work. Unfortunately, this meant that the game was far less finished than we had hoped it would be, and is the reason there is no sound and the music doesn't loop.
It's strange that the zombies were running at you quickly, they shouldn't be moving fast so we'll have to look into that as that means that there is an issue with the code.