Games like Retro Gadgets
Games like Retro Gadgets include SHENZHEN I/O, Opus Magnum, while True: learn(), The Farmer Was Replaced, and PC Building Simulator. We matched them by the tags players give Retro Gadgets on Steam (Education, Automation, 2D, Puzzle, and Building): closest matches first, and among equally close ones the better-known games.

SHENZHEN I/O
Shared: Automation · Puzzle · Education

Opus Magnum
Shared: Automation · Puzzle · Programming

while True: learn()
Shared: Education · Puzzle · Simulation

The Farmer Was Replaced
Shared: Automation · Education · Puzzle

PC Building Simulator
Shared: Education · Simulation · Building

Human Resource Machine
Shared: Puzzle · Education · Automation

Poly Bridge
Shared: Building · Puzzle · Simulation

shapez 2 - Factory
Shared: Automation · Building · Puzzle

Kaizen: A Factory Story
Shared: Puzzle · Automation · Programming

Infinifactory
Shared: Automation · Puzzle · Building

shapez
Shared: Automation · Sandbox · Building

Virtual Circuit Board
Shared: Education · Automation · Simulation

TIS-100
Shared: Puzzle · Education · Programming

Craftomation 101: Programming & Craft
Shared: Education · Automation · Puzzle

People Playground
Shared: 2D · Sandbox · Simulation

Last Call BBS
Shared: Automation · Puzzle · Sandbox

Factorio
Shared: Automation · Sandbox · Building

Automation - The Car Company Tycoon Game
Shared: Building · Simulation · Sandbox

Kerbal Space Program
Shared: Simulation · Education · Sandbox

Bridge Constructor Portal
Shared: Puzzle · Simulation · Building

Poly Bridge 2
Shared: Building · Puzzle · Simulation

Dyson Sphere Program
Shared: Automation · Building · Simulation

House Flipper
Shared: Simulation · Building · Education

Prison Architect
Shared: Building · Simulation · Sandbox