SwarmZ

"SwarmZ is a humorous post-apocalyptic strategy game where you defend a baby, possibly humanity's last hope, from massive zombie hordes. The game features an ultra-high performance crowd rendering system, allowing for 100,000+ zombies on screen at once. With a campaign, sandbox mode, and various silly units, SwarmZ offers around 5 hours of playtime in a zombie-filled world inspired by famous pop-culture."