Games like Uncrewed
Games like Uncrewed include Factorio, Prison Architect, Garry's Mod, Space Engineers, and Scrap Mechanic. We matched them by the tags players give Uncrewed on Steam (Strategy, Action, Simulation, RTS, and Sandbox): closest matches first, and among equally close ones the better-known games.

Factorio
Shared: Strategy · Sandbox · Base Building

Prison Architect
Shared: Simulation · Strategy · Sandbox

Garry's Mod
Shared: Sandbox · Building · Multiplayer

Space Engineers
Shared: Sandbox · Simulation · Building

Scrap Mechanic
Shared: Sandbox · Building · Multiplayer

Cities: Skylines
Shared: Simulation · Strategy · Building

Manor Lords
Shared: Strategy · Simulation · Base Building

Forts
Shared: Strategy · Base Building · Multiplayer

Anno 1800
Shared: Strategy · Simulation · Sandbox

House Flipper
Shared: Simulation · Building · Sandbox

Jurassic World Evolution
Shared: Simulation · Strategy · Building

Satisfactory
Shared: Base Building · Building · Multiplayer

Halo Wars: Definitive Edition
Shared: Strategy · RTS · Base Building

Mindustry
Shared: Strategy · RTS · Base Building

Jurassic World Evolution 2
Shared: Simulation · Building · Strategy

Oxygen Not Included
Shared: Base Building · Building · Strategy

Once Human
Shared: Action · Multiplayer · Building

Age of Empires II (Retired)
Shared: Strategy · RTS · Multiplayer

Planet Coaster
Shared: Simulation · Building · Strategy

Call to Arms
Shared: Strategy · Action · RTS

Mount & Blade II: Bannerlord
Shared: Strategy · Action · Sandbox

Totally Accurate Battle Simulator
Shared: Simulation · Strategy · Sandbox

Anno 2070™
Shared: Strategy · Simulation · RTS

Schedule I
Shared: Simulation · Multiplayer · Action