What does the population counter on nuke town zombies mean?

In "Nuketown Zombies," the population counter serves as a gameplay mechanic that tracks the number of zombies killed by players. It reflects the in-game theme of a post-apocalyptic world and adds to the atmosphere by showcasing a declining population in a once-bustling town. As players progress and defeat more zombies, the counter increases, which can also serve as a motivator for players to achieve higher kill counts. Overall, it enhances the experience by linking gameplay to the narrative of the map.