Games like What's Up There?
Games like What's Up There? include No Man's Sky, The Long Dark, Firewatch, The Forest, and Starbound. We matched them by the tags players give What's Up There? on Steam (Precision Platformer, Walking Simulator, Survival, Open World, and Choices Matter): closest matches first, and among equally close ones the better-known games.

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

The Long Dark
Shared: Survival · Open World · Adventure

Firewatch
Shared: Walking Simulator · Adventure · Open World

The Forest
Shared: Survival · Open World · Adventure

Starbound
Shared: Survival · Space · Open World

Don't Starve Together
Shared: Survival · Open World · Adventure

Outer Wilds
Shared: Space · Open World · Mystery

Chained Together
Shared: Puzzle Platformer · Adventure · 3D Platformer

Sons Of The Forest
Shared: Survival · Open World · Adventure

Palworld
Shared: Survival · Open World · Adventure

The Isle
Shared: Survival · Open World · Simulation

Rust
Shared: Survival · Open World · Adventure

ASTRONEER
Shared: Open World · Survival · Space

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

Space Engineers
Shared: Survival · Open World · Space

7 Days to Die
Shared: Survival · Open World · Adventure

theHunter: Call of the Wild™
Shared: Open World · Survival · Simulation

Refunct
Shared: 3D Platformer · Puzzle Platformer · Open World

Project Zomboid
Shared: Survival · Open World · Simulation

Don't Starve
Shared: Survival · Open World · Adventure

Once Human
Shared: Open World · Survival · Adventure

The Witness
Shared: Open World · Walking Simulator · Puzzle

Subnautica
Shared: Survival · Open World · Adventure

The Long Drive
Shared: Survival · Open World · Adventure