Games like Earth Warrior
Games like Earth Warrior include Fallout 4, Slime Rancher, The Long Dark, Firewatch, and Subnautica. We matched them by the tags players give Earth Warrior on Steam (Adventure, Nature, Open World, Singleplayer, and Exploration): closest matches first, and among equally close ones the better-known games.

Fallout 4
Shared: Open World · Singleplayer · Adventure

Slime Rancher
Shared: Adventure · Exploration · Open World

The Long Dark
Shared: Open World · Exploration · Adventure

Firewatch
Shared: Adventure · Singleplayer · Open World

Subnautica
Shared: Open World · Exploration · Adventure

Fallout: New Vegas
Shared: Open World · Singleplayer · Exploration

No Man's Sky
Shared: Open World · Exploration · Adventure

Rise of the Tomb Raider™
Shared: Adventure · Singleplayer · Open World

Grand Theft Auto V Legacy
Shared: Open World · Adventure · First-Person

Subnautica: Below Zero
Shared: Open World · Singleplayer · Exploration

The Forest
Shared: Open World · Adventure · First-Person

Crimson Desert Enhanced
Shared: Open World · Adventure · Singleplayer

Hogwarts Legacy
Shared: Open World · Adventure · Singleplayer

Outer Wilds
Shared: Adventure · Exploration · Open World

The Elder Scrolls IV: Oblivion Remastered
Shared: Open World · Adventure · Singleplayer

The Elder Scrolls V: Skyrim VR
Shared: VR · Open World · Adventure

Valley
Shared: Adventure · Exploration · Singleplayer

The Witness
Shared: Open World · Exploration · Singleplayer

Tainted Grail: The Fall of Avalon
Shared: Adventure · Open World · Exploration

Far Cry® Primal
Shared: Open World · Adventure · Singleplayer

Avatar: Frontiers of Pandora™
Shared: Adventure · Open World · Singleplayer

X-Plane 11
Shared: VR · Open World · Singleplayer

A Short Hike
Shared: Adventure · Exploration · Open World

The Elder Scrolls IV: Oblivion® Game of the Year Edition (2009)
Shared: Open World · Singleplayer · Adventure