Games like Outerverse
Games like Outerverse include Starfield, No Man's Sky, The Forest, Fallout 4, and Elite Dangerous. We matched them by the tags players give Outerverse on Steam (Voxel, RPG, Action, Singleplayer, and First-Person): closest matches first, and among equally close ones the better-known games.

Starfield
Shared: RPG · Singleplayer · Space

No Man's Sky
Shared: Space · Open World Survival Craft · Exploration

The Forest
Shared: Open World Survival Craft · Action · First-Person

Fallout 4
Shared: Singleplayer · RPG · First-Person

Elite Dangerous
Shared: Space Sim · Space · Action

Fallout: New Vegas
Shared: RPG · Singleplayer · Action

Once Human
Shared: Action · Open World Survival Craft · RPG

Satisfactory
Shared: Automation · Crafting · Base Building

Far Cry® Primal
Shared: Action · First-Person · Singleplayer

The Long Dark
Shared: Singleplayer · Open World Survival Craft · First-Person

Green Hell
Shared: Action · Open World Survival Craft · Singleplayer

Kingdom Come: Deliverance II
Shared: RPG · Singleplayer · First-Person

The Last Caretaker
Shared: Automation · Singleplayer · Crafting

Rust
Shared: Crafting · Open World Survival Craft · First-Person

Subnautica
Shared: Open World Survival Craft · Singleplayer · First-Person

Breathedge
Shared: Singleplayer · Space · Open World Survival Craft

ARK: Survival Evolved
Shared: Open World Survival Craft · Action · Crafting

Mount & Blade II: Bannerlord
Shared: RPG · Singleplayer · Action

Cyberpunk 2077
Shared: RPG · Singleplayer · First-Person

Tainted Grail: The Fall of Avalon
Shared: RPG · First-Person · Singleplayer

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

The Elder Scrolls IV: Oblivion® Game of the Year Edition (2009)
Shared: RPG · Singleplayer · First-Person

Empyrion - Galactic Survival
Shared: Space · Open World Survival Craft · Voxel

Crimson Desert Enhanced
Shared: Action · Singleplayer · RPG