Like Ian, I also had trouble figuring out what to do. There were a lot of options, guns, switches, zombies, ammo, progress bars and the 40 second timer was a bit to fast for me to take everything in. Perhaps a button that "starts" the day so that you have time to take in your surroundings and figure out what you need to do and prepare before the run actually starts would be a good addition. That a long with a structured tutorial or even pop ups with explanations of what the player should be doing would make the whole experience much smoother. I think all the pieces for a great game are there, it's just not clear what the goal is.