Games like Elite Dangerous: Odyssey
Games like Elite Dangerous: Odyssey include Elite Dangerous, EVE Online, No Man's Sky, SPORE™ Galactic Adventures, and Mount & Blade II: Bannerlord. We matched them by the tags players give Elite Dangerous: Odyssey on Steam (Early Access, Simulation, Massively Multiplayer, Adventure, and Action): closest matches first, and among equally close ones the better-known games.

Elite Dangerous
Shared: Simulation · Space Sim · Massively Multiplayer

EVE Online
Shared: Adventure · Space Sim · Simulation

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

SPORE™ Galactic Adventures
Shared: Simulation · Action · Adventure

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

Once Human
Shared: Action · Open World · Adventure

The Isle
Shared: Simulation · Massively Multiplayer · Early Access

Starfield
Shared: RPG · Space · Open World

Starbase
Shared: Massively Multiplayer · Simulation · Space Sim

Mount & Blade: Warband
Shared: RPG · Action · Strategy

The Elder Scrolls Online - Standard Edition
Shared: RPG · Adventure · Massively Multiplayer

Fallout 4
Shared: Adventure · RPG · Open World

EmergeNYC
Shared: Early Access · Simulation · Action

Between the Stars
Shared: Simulation · Action · RPG

Rebel Galaxy
Shared: Adventure · RPG · Space

X4: Foundations
Shared: Simulation · Space · Space Sim

SpaceCraft
Shared: Massively Multiplayer · Space · Simulation

Fallout: New Vegas
Shared: RPG · Open World · Action

Space Rangers HD: A War Apart
Shared: Simulation · Adventure · RPG

Rust
Shared: Adventure · Open World · Massively Multiplayer

Star Trek Online
Shared: Massively Multiplayer · RPG · Sci-fi

PUBG: BATTLEGROUNDS
Shared: Action · Massively Multiplayer · Early Access

X Rebirth
Shared: Simulation · Action · Space

Last Oasis
Shared: Massively Multiplayer · Action · Adventure