PPG wrote, "Calling Annihilation Undead a mindless shooter is probably flattering to its developer. It's certainly literally true, since this $1.99 twin-stick gorefest is about killing lots of zombies with lots of weapons, and pretty much nothing else.
There's an audience for this stuff, just like there's one for the endless Living Dead movie sequels. But Annihilation Undead stirs about as much horror and bloodlust as a script reading. The action is endlessly repetitive, and the terrain, characters and weapons weak on distinction."