Games like Planetoid
Games like Planetoid include Kerbal Space Program, Totally Accurate Battle Simulator, Reassembly, Space Engineers, and Trailmakers. We matched them by the tags players give Planetoid on Steam (Indie, Strategy, Action, Adventure, and Space): closest matches first, and among equally close ones the better-known games.
Kerbal Space Program
Shared: Space · Sandbox · Indie
Totally Accurate Battle Simulator
Shared: Strategy · Sandbox · Indie
Reassembly
Shared: Strategy · Space · Building
Space Engineers
Shared: Space · Building · Sandbox
Trailmakers
Shared: Action · Space · Adventure
Space Pirates And Zombies 2
Shared: Strategy · Indie · Action
Cultivation Tales
Shared: Action · Building · Sandbox
From the Depths
Shared: Building · Sandbox · Strategy
Orcs Must Die! 2
Shared: Action · Strategy · Indie
Space Run
Shared: Strategy · Indie · Space
Terraria
Shared: Sandbox · Adventure · Building
Mount & Blade II: Bannerlord
Shared: Strategy · Action · Sandbox
Starbound
Shared: Adventure · Space · Sandbox
TerraTech
Shared: Building · Sandbox · Action
Celestial Command
Shared: Indie · Strategy · Space
Starship EVO
Shared: Indie · Action · Space
Creeper World 4
Shared: Tower Defense · Strategy · Building
Scrap Mechanic
Shared: Building · Sandbox · Adventure
Total Tank Simulator
Shared: Strategy · Action · Indie
StarMade
Shared: Space · Building · Sandbox
Between the Stars
Shared: Action · Indie · Space
Rock 'N' Roll Defense
Shared: Strategy · Action · Indie
Castle Story
Shared: Strategy · Building · Indie
Forts
Shared: Strategy · Building · Physics