Games like Crazy Engineer
Games like Crazy Engineer include Garry's Mod, s&box, House Flipper, Planet Coaster, and Totally Accurate Battle Simulator. We matched them by the tags players give Crazy Engineer on Steam (Action, Casual, Simulation, Arcade, and Building): closest matches first, and among equally close ones the better-known games.

Garry's Mod
Shared: Sandbox · Casual · Building

s&box
Shared: Casual · Action · Building

House Flipper
Shared: Simulation · Building · Casual

Planet Coaster
Shared: Simulation · Building · Sandbox

Totally Accurate Battle Simulator
Shared: Simulation · Sandbox · Strategy

Schedule I
Shared: Simulation · Action · Base Building

Space Engineers
Shared: Building · Simulation · Sandbox

Internet Cafe Simulator 2
Shared: Simulation · Arcade · 3D

Cities: Skylines
Shared: Simulation · Building · Sandbox

PC Building Simulator
Shared: Simulation · Building · Sandbox

Scrap Mechanic
Shared: Building · Sandbox · Base Building

Once Human
Shared: Action · Building · Base Building

Factorio
Shared: Base Building · Sandbox · Building

Gas Station Simulator
Shared: Simulation · Casual · Building

PowerWash Simulator
Shared: Casual · Simulation · Sandbox

Prison Architect
Shared: Simulation · Building · Base Building

Medieval Dynasty
Shared: Building · Base Building · Sandbox

The Infected
Shared: Base Building · Action · Building

Arma 3
Shared: Action · Simulation · First-Person

Goat Simulator
Shared: Simulation · Casual · Sandbox

The Forest
Shared: Building · Action · Crafting

Ultimate Epic Battle Simulator 2
Shared: Simulation · Action · Sandbox

Satisfactory
Shared: Base Building · Building · Sandbox

Kenshi
Shared: Sandbox · Simulation · Action