Games like Into the Stars
Games like Into the Stars include FTL: Faster Than Light, Space Pirates And Zombies 2, Feed and Grow: Fish, Between the Stars, and Home Behind 2. We matched them by the tags players give Into the Stars on Steam (Simulation, Strategy, Space, Indie, and Adventure): closest matches first, and among equally close ones the better-known games.

FTL: Faster Than Light
Shared: Strategy · Space · Indie

Space Pirates And Zombies 2
Shared: Strategy · Space · Indie

Feed and Grow: Fish
Shared: Simulation · Survival · Indie

Between the Stars
Shared: Space · Simulation · Strategy

Home Behind 2
Shared: Strategy · Simulation · Adventure

No Man's Sky
Shared: Space · Survival · Adventure

SPORE™ Galactic Adventures
Shared: Simulation · Space · Adventure

Heat Signature
Shared: Space · Indie · Strategy

The Long Journey Home
Shared: Simulation · Strategy · Indie

Deliver Us The Moon
Shared: Indie · Adventure · Space

Battlevoid: Harbinger
Shared: Strategy · Simulation · Space

Stellaris
Shared: Strategy · Space · Simulation

Space Rangers HD: A War Apart
Shared: Space · Strategy · Simulation

Spacebase DF-9
Shared: Simulation · Space · Strategy

Empyrion - Galactic Survival
Shared: Simulation · Space · Survival

Celestial Command
Shared: Simulation · Space · Strategy

Totally Accurate Battle Simulator
Shared: Simulation · Strategy · Indie

The Escapists
Shared: Strategy · Simulation · Indie

Cosmoteer: Starship Architect & Commander
Shared: Space · Strategy · Indie

PUBG: BATTLEGROUNDS
Shared: Survival · Action · Strategy

Home Behind
Shared: Adventure · Simulation · Indie

Kerbal Space Program
Shared: Simulation · Space · Indie

Space Engineers
Shared: Space · Simulation · Survival

Don't Starve Together
Shared: Survival · Adventure · Indie