Games like TerraTech: R&D Labs
Games like TerraTech: R&D Labs include Reassembly, Mount & Blade II: Bannerlord, Cultivation Tales, Totally Accurate Battle Simulator, and TerraTech. We matched them by the tags players give TerraTech: R&D Labs on Steam (Strategy, Action, Indie, Building, and Sandbox): closest matches first, and among equally close ones the better-known games.

Reassembly
Shared: Strategy · Building · Sandbox

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

Cultivation Tales
Shared: Building · Sandbox · Action

Totally Accurate Battle Simulator
Shared: Strategy · Sandbox · Indie

TerraTech
Shared: Building · Sandbox · Action

Total Tank Simulator
Shared: Strategy · Action · Sandbox

Planet Coaster
Shared: Building · Strategy · Sandbox

Freeman: Guerrilla Warfare
Shared: Strategy · Action · Indie

Forts
Shared: Strategy · Building · Sandbox

From the Depths
Shared: Building · Sandbox · Strategy

Jurassic World Evolution
Shared: Building · Strategy · Sandbox

Castle Story
Shared: Strategy · Building · Sandbox

Cities: Skylines
Shared: Strategy · Building · Sandbox

Your Only Move Is HUSTLE
Shared: Action · Strategy · Sandbox

Terraria
Shared: Sandbox · Building · Indie

s&box
Shared: Sandbox · Building · Action

Ancient Warfare 3
Shared: Action · Strategy · Sandbox

Garry's Mod
Shared: Sandbox · Building · Action

House Flipper
Shared: Building · Sandbox · Strategy

Prison Architect
Shared: Building · Strategy · Sandbox

Mount & Blade: Warband
Shared: Strategy · Action · Sandbox

Space Engineers
Shared: Building · Sandbox · Indie

King Arthur's Gold
Shared: Action · Building · Indie

Kenshi
Shared: Sandbox · Strategy · Action