I also forgot to add that the game ends when the human race is exterminated by the zombie horde. This means that when time runs out, all players die. Commands are available via in-game help in the quests menu.
I've said this before: I just love it when PC users comment in a Mac-only application that they want a version for Windows. If you would look in the tools list, it would show a "Finder" logo indicating it's for Mac. Besides, you PC users have more tools.
As for this application: