Games like Cataclysm: Dark Days Ahead
Games like Cataclysm: Dark Days Ahead include Terraria, 7 Days to Die, Terminus: Zombie Survivors, Stoneshard, and Project Zomboid. We matched them by the tags players give Cataclysm: Dark Days Ahead on Steam (Traditional Roguelike, Sandbox, RPG, Survival, and Roguelike): closest matches first, and among equally close ones the better-known games.

Terraria
Shared: Sandbox · Survival · 2D

7 Days to Die
Shared: Survival · Zombies · Sandbox

Terminus: Zombie Survivors
Shared: Survival · Roguelike · Zombies

Stoneshard
Shared: RPG · Roguelike · Survival

Project Zomboid
Shared: Survival · Sandbox · Zombies

Don't Starve
Shared: Survival · Sandbox · Adventure

Subnautica
Shared: Survival · Horror · Adventure

Dune: Awakening
Shared: Survival · Sandbox · Adventure

Fallout 4
Shared: RPG · Adventure · Exploration

The Forest
Shared: Survival · Adventure · Horror

Don't Starve Together
Shared: Survival · Sandbox · Adventure

Fallout: New Vegas
Shared: RPG · Adventure · Exploration

Starbound
Shared: Sandbox · Survival · Adventure

Elin
Shared: RPG · Roguelike · Traditional Roguelike

SKYHILL
Shared: Survival · Adventure · Roguelike

Keplerth
Shared: Sandbox · Survival · Adventure

Portal Knights
Shared: Sandbox · RPG · Adventure

DayZ
Shared: Survival · Zombies · Sandbox

Crashlands
Shared: RPG · Survival · Sandbox

鬼谷八荒 Tale of Immortal
Shared: Sandbox · RPG · Singleplayer

No Man's Sky
Shared: Survival · Sandbox · Exploration

Forager
Shared: Survival · Sandbox · 2D

Core Keeper
Shared: Survival · Sandbox · Exploration

Dying Light
Shared: Zombies · Survival · Horror