I've finished the player side of the engine, all collision detection and slide have been implemented, along with gravity and jumping!
Now I need to add enemy AI and collision along with path finding and other features needed to have the zombies hunt down the player, this will be done over the next couple of weeks.
Then I will add full lighting and physics to create the final engine.
Currently it everything runs at 60fps on our test machine.
Once I get some AI in and animations done I'll add a video.