In this game, you have a brief introduction explaining how zombies have caused an apocalypse, and then you become the commander of a base that needs to defend from zombies.
As commander, you have people you can assign to tasks. In the Easy Mode I played in, there were 6 roles (farmer, builder, etc.) each with several subtasks. It was overwhelming at first, especially when different bars started counting down in real time, but once I realized how slow it was I realized there was tons of time to make decisions.
Maybe too much time; the game got a little repetitive pretty quickly. I focused on farming and finding more survivors until those maxed out, then built a research base and focused on finding a cure.
Overall, the writing was goofy, but descriptive and vivid, and the simulation held together surprisingly well. I think it could have used a bit more variety though; I spent most of the game with the game in a side window just running, waiting for it to be done.