Games like Final Days
Games like Final Days include Left 4 Dead 2, DayZ, Back 4 Blood, Killing Floor 2, and Left 4 Dead. We matched them by the tags players give Final Days on Steam (Zombies, Online Co-Op, Survival, Top-Down Shooter, and Twin Stick Shooter): closest matches first, and among equally close ones the better-known games.

Left 4 Dead 2
Shared: Zombies · Co-op · Online Co-Op

DayZ
Shared: Zombies · Survival · Online Co-Op

Back 4 Blood
Shared: Zombies · Online Co-Op · Co-op

Killing Floor 2
Shared: Zombies · Online Co-Op · Multiplayer

Left 4 Dead
Shared: Zombies · Co-op · Online Co-Op

Dying Light
Shared: Zombies · Online Co-Op · Survival

HELLDIVERS™ 2
Shared: Online Co-Op · Co-op · PvE

7 Days to Die
Shared: Zombies · Survival · Online Co-Op

Killing Floor
Shared: Zombies · Co-op · Survival

HELLDIVERS™ Dive Harder Edition
Shared: Co-op · Online Co-Op · Top-Down Shooter

No More Room in Hell 2
Shared: Zombies · Online Co-Op · Co-op

World War Z
Shared: Zombies · Online Co-Op · Co-op

PUBG: BATTLEGROUNDS
Shared: Survival · Shooter · Online Co-Op

Resident Evil 6
Shared: Zombies · Co-op · Online Co-Op

Resident Evil 5
Shared: Co-op · Zombies · Online Co-Op

Nation Red
Shared: Zombies · Online Co-Op · Top-Down Shooter

Dead by Daylight
Shared: Online Co-Op · Co-op · Survival

ARC Raiders
Shared: Online Co-Op · PvE · Multiplayer

MISERY
Shared: Survival · Online Co-Op · Co-op

Project Zomboid
Shared: Zombies · Survival · Co-op

R.E.P.O.
Shared: Online Co-Op · Co-op · Multiplayer

How to Survive
Shared: Zombies · Survival · Co-op

Resident Evil Revelations 2
Shared: Zombies · Co-op · Survival

GTFO
Shared: Online Co-Op · Co-op · Shooter