The Midnight Walkers was recently launched on Steam in "early access" format. It is a PvPvE extraction shooter set in a world with zombies.
Players are invited to go on a raid to Liberty Grand Center — a huge building complex in Golden County with many floors, each of which has its own theme and unique loot:
The threat here is not only zombies or other survivors. Over time, the poisonous gas system spreads to random floors, and you will have to use elevators or stairs to avoid it.
The first reviews of The Midnight Walkers on Steam are "mixed" — some players complain about technical issues (they cannot connect to the servers) and also criticize the balance.