"2012 Zombies vs Aliens Warfare" – No Such Game Exists

There is no game titled "2012 Zombies vs Aliens Warfare" on any platform. You may be misremembering:

• Zombie Army 4: Dead War (2020) – Nazi zombies, co-op, Rebellion.
• Earth Defense Force 2017 / 2025 / 5 – Giant aliens/insects, not zombies.
• Plants vs. Zombies (2009) – Tower defense, plants vs. zombies.
• Call of Duty: Black Ops II (2012) – "Zombies" mode (TranZit, Die Rise, Buried) + "Nuketown 2025" – but no aliens.
• Natural Selection 2 (2012) – Marines vs. Aliens (FPS/RTS hybrid).

Free-to-Play Zombie/Alien Shooters (2024)

• Warframe – Space ninjas vs. Infested (zombie-like) / Grineer / Corpus.
• Deep Rock Galactic (paid) – Dwarves vs. alien bugs.
• Alien Swarm: Reactive Drop (Free, top-down co-op).

Check your memory: platform, perspective (FPS/TPS/top-down), art style. Search that.