Games like Orbitect
Games like Orbitect include Kerbal Space Program, Space Engineers, Dyson Sphere Program, Rogue Tower, and FTL: Faster Than Light. We matched them by the tags players give Orbitect on Steam (Roguelite, Tower Defense, Indie, Building, and Space): closest matches first, and among equally close ones the better-known games.
Kerbal Space Program
Shared: Space · Sandbox · Building
Space Engineers
Shared: Building · Space · Sandbox
Dyson Sphere Program
Shared: Space · Building · Sandbox
Rogue Tower
Shared: Tower Defense · Strategy · Roguelite
FTL: Faster Than Light
Shared: Space · Indie · Strategy
Totally Accurate Battle Simulator
Shared: Sandbox · Strategy · Indie
Avorion
Shared: Building · Sandbox · Space
Emberward
Shared: Tower Defense · Roguelite · Strategy
Prison Architect
Shared: Building · Sandbox · Strategy
Bloons TD 6
Shared: Tower Defense · Strategy · 3D
Planet Coaster
Shared: Building · Sandbox · Strategy
Garry's Mod
Shared: Sandbox · Building · Funny
Oxygen Not Included
Shared: Building · Sandbox · Base Building
Cluckmech Oasis
Shared: Tower Defense · Strategy · Roguelite
Two Point Hospital
Shared: Building · Indie · Strategy
Cities: Skylines
Shared: Building · Strategy · Sandbox
Tower Dominion
Shared: Tower Defense · Strategy · Roguelite
Kerbal Space Program 2
Shared: Space · Building · Sandbox
Creeper World 4
Shared: Tower Defense · Building · Space
Drill Core
Shared: Roguelite · Tower Defense · Strategy
Against the Storm
Shared: Strategy · Building · Roguelite
House Flipper
Shared: Building · Sandbox · Simulation
Thronefall
Shared: Tower Defense · Strategy · Building
Game Dev Tycoon
Shared: Indie · Strategy · Simulation