Dead Days 1.2 for Mac could be downloaded from the developer's website when we last checked. We cannot confirm if there is a free download of this app available. The program lies within Games, more precisely Action. We recommend checking the downloaded files with any free antivirus.
From the developer:
3D Game where you control an armored robot against hordes of reanimated corpses in a quest to find the source of an apocalyptic plague.Experience intense 3D third person thrills as your battle robot is surrounded by reanimating undead horrors, in a city, a police station, and a dark forest. Controls: W forward S backward A step left D step right Space Punch Mouse turn Mouse button Shoot
You may want to check out more software for Mac, such as Calavera: Day of the Dead CE, IGT Slots Day of the Dead or Deadly Voltage: Rise of the Invincible, which might be related to Dead Days.