Games like Tech Empire
Games like Tech Empire include Totally Accurate Battle Simulator, Cities: Skylines, Potion Craft: Alchemist Simulator, 鬼谷八荒 Tale of Immortal, and Banished. We matched them by the tags players give Tech Empire on Steam (Simulation, Incremental, Sandbox, Programming, and Minimalist): closest matches first, and among equally close ones the better-known games.

Totally Accurate Battle Simulator
Shared: Simulation · Sandbox · Singleplayer

Cities: Skylines
Shared: Simulation · Sandbox · Singleplayer

Potion Craft: Alchemist Simulator
Shared: Simulation · Singleplayer · Sandbox

鬼谷八荒 Tale of Immortal
Shared: Simulation · Sandbox · Singleplayer

Banished
Shared: Simulation · Sandbox · Indie

Oxygen Not Included
Shared: Resource Management · Simulation · Sandbox

Kerbal Space Program
Shared: Simulation · Sandbox · Indie

Cities: Skylines II
Shared: Simulation · Sandbox · Singleplayer

Drug Dealer Simulator
Shared: Simulation · Indie · Resource Management

People Playground
Shared: Sandbox · Simulation · Singleplayer

while True: learn()
Shared: Simulation · Programming · Sandbox

Foundation
Shared: Simulation · Sandbox · Resource Management

House Flipper
Shared: Simulation · Sandbox · Singleplayer

The Farmer Was Replaced
Shared: Programming · Minimalist · Simulation

Space Engineers
Shared: Sandbox · Simulation · Singleplayer

Prison Architect
Shared: Simulation · Sandbox · Resource Management

Autonauts
Shared: Simulation · Programming · Indie

Garry's Mod
Shared: Sandbox · Simulation · Singleplayer

Big Ambitions
Shared: Simulation · Sandbox · Resource Management

A Game About Feeding A Black Hole
Shared: Incremental · Simulation · Indie

Goat Simulator
Shared: Simulation · Sandbox · Indie

Mini Motorways
Shared: Simulation · Minimalist · Indie

Scritchy Scratchy
Shared: Incremental · Simulation · Resource Management

Opus Magnum
Shared: Programming · Simulation · Indie