Games like Gravitura
Games like Gravitura include Kerbal Space Program, Deliver Us The Moon, Mountain, House of the Dying Sun, and Solar 2. We matched them by the tags players give Gravitura on Steam (Action, Indie, Casual, Simulation, and Space): closest matches first, and among equally close ones the better-known games.

Kerbal Space Program
Shared: Simulation · Space · Space Sim

Deliver Us The Moon
Shared: Indie · Action · Space

Mountain
Shared: Indie · Simulation · Casual

House of the Dying Sun
Shared: Action · Indie · Simulation

Solar 2
Shared: Indie · Casual · Space

Mini Motorways
Shared: Casual · Simulation · Indie

Elite Dangerous
Shared: Space · Space Sim · Simulation

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

Papers, Please
Shared: Indie · Simulation · Singleplayer

KovaaK's
Shared: Action · Simulation · Indie

Goat Simulator
Shared: Simulation · Casual · Indie

Defy Gravity Extended
Shared: Indie · Action · Space

Door Kickers
Shared: Action · Simulation · Indie

Between the Stars
Shared: Action · Space · Indie

House Flipper
Shared: Simulation · Singleplayer · Casual

EVERSPACE™
Shared: Action · Indie · Space

Kinetic Void
Shared: Indie · Action · Simulation

Space Engineers
Shared: Space · Simulation · Indie

Game Dev Tycoon
Shared: Indie · Simulation · Casual

Trailmakers
Shared: Action · Space · Singleplayer

Sparkle 2 Evo
Shared: Indie · Casual · Action

Drug Dealer Simulator
Shared: Action · Simulation · Indie

Starpoint Gemini 2
Shared: Simulation · Space · Action

X Rebirth
Shared: Action · Simulation · Space