Games like ROVA
Games like ROVA include SPORE™, Avorion, EVE Online, Elite Dangerous, and No Man's Sky. We matched them by the tags players give ROVA on Steam (Exploration, Colony Sim, Sandbox, Nature, and Space): closest matches first, and among equally close ones the better-known games.

SPORE™
Shared: Sandbox · Colony Sim · Exploration

Avorion
Shared: Exploration · Sandbox · Space Sim

EVE Online
Shared: Exploration · Space Sim · Space

Elite Dangerous
Shared: Exploration · Space · Space Sim

No Man's Sky
Shared: Exploration · Space · Sandbox

Kerbal Space Program
Shared: Sandbox · Space · Space Sim

X4: Foundations
Shared: Exploration · Space · Sandbox

SpaceEngine
Shared: Sandbox · Space · Space Sim

Universe Sandbox
Shared: Sandbox · Space · Space Sim

Kerbal Space Program 2
Shared: Exploration · Sandbox · Space

Spaceflight Simulator
Shared: Sandbox · Exploration · Space

Starbound
Shared: Sandbox · Space · Exploration

Empyrion - Galactic Survival
Shared: Space · Exploration · Simulation

Exo One
Shared: Exploration · Space · Relaxing

Slime Rancher
Shared: Exploration · Sandbox · Adventure

ASTRONEER
Shared: Exploration · Space · Sandbox

Big Walk
Shared: Exploration · Sandbox · Relaxing

Space Engineers
Shared: Sandbox · Space · Simulation

Starfield
Shared: Space · Exploration · Open World

Goat Simulator 3
Shared: Exploration · Sandbox · 3D

Oxygen Not Included
Shared: Colony Sim · Sandbox · Space

Outer Wilds
Shared: Exploration · Space · Adventure

A Short Hike
Shared: Exploration · Relaxing · Nature

Stellaris
Shared: Space · Exploration · Sandbox