Games like Exo One: Prologue
Games like Exo One: Prologue include Exo One, Outer Wilds, SpaceEngine, Deliver Us The Moon, and Journey. We matched them by the tags players give Exo One: Prologue on Steam (Flight, Sci-fi, Adventure, Relaxing, and Atmospheric): closest matches first, and among equally close ones the better-known games.

Exo One
Shared: Flight · Atmospheric · Adventure

Outer Wilds
Shared: Adventure · Mystery · Atmospheric

SpaceEngine
Shared: Sci-fi · Flight · 3D

Deliver Us The Moon
Shared: Adventure · Sci-fi · Atmospheric

Journey
Shared: Adventure · Atmospheric · Relaxing

Firewatch
Shared: Adventure · Atmospheric · Mystery

AER Memories of Old
Shared: Adventure · Relaxing · Flight

Superflight
Shared: Flight · Relaxing · Atmospheric

ABZU
Shared: Relaxing · Atmospheric · Adventure

Flower
Shared: Relaxing · Atmospheric · Adventure

Microsoft Flight Simulator (2020) 40th Anniversary Edition
Shared: Flight · Simulation · Adventure

Observation
Shared: Adventure · Sci-fi · Atmospheric

What Remains of Edith Finch
Shared: Atmospheric · Mystery · Adventure

DEATH STRANDING DIRECTOR'S CUT
Shared: Atmospheric · Adventure · Walking Simulator

Stray
Shared: Adventure · Atmospheric · Sci-fi

Tacoma
Shared: Adventure · Sci-fi · Walking Simulator

No Man's Sky
Shared: Sci-fi · Adventure · Space

Quern - Undying Thoughts
Shared: Adventure · Atmospheric · Mystery

Universe Sandbox
Shared: Relaxing · Simulation · Space

X-Plane 11
Shared: Flight · Simulation · Adventure

The Station
Shared: Adventure · Sci-fi · Atmospheric

The Invincible
Shared: Adventure · Sci-fi · Walking Simulator

Submerged
Shared: Relaxing · Walking Simulator · Adventure

Placid Plastic Duck Simulator
Shared: Relaxing · 3D · Physics