Games like MECHS
Games like MECHS include Papers, Please, KovaaK's, Game Dev Tycoon, Russian Life Simulator, and Aimlabs. We matched them by the tags players give MECHS on Steam (Action, Casual, Simulation, Point & Click, and 2D Platformer): closest matches first, and among equally close ones the better-known games.

Papers, Please
Shared: Simulation · Point & Click · Indie

KovaaK's
Shared: Action · Simulation · FPS

Game Dev Tycoon
Shared: Simulation · Casual · Indie

Russian Life Simulator
Shared: Simulation · Action · Casual

Aimlabs
Shared: Action · Simulation · FPS

WARDOGS
Shared: Action · FPS · Simulation

Garry's Mod
Shared: Casual · Simulation · FPS

Plague Inc: Evolved
Shared: Simulation · Casual · Indie

Super Meat Boy
Shared: Precision Platformer · 2D Platformer · Indie

Celeste
Shared: Precision Platformer · 2D Platformer · Indie

Gang Beasts
Shared: Action · Casual · Simulation

Arma 3
Shared: Action · Simulation · FPS

SANABI
Shared: Action · 2D Platformer · 2D

There Is No Game: Wrong Dimension
Shared: Point & Click · Casual · Indie

Retrowave
Shared: Casual · Action · Simulation

That's not my Neighbor
Shared: Casual · Point & Click · Simulation

Goat Simulator
Shared: Simulation · Casual · Action

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

Sparkle 2 Evo
Shared: Casual · Action · Simulation

Downwell
Shared: Precision Platformer · Action · 2D Platformer

Squad 44
Shared: Simulation · FPS · Action

Contractors
Shared: Action · Simulation · FPS

House Flipper
Shared: Simulation · Casual · Singleplayer

Call of Duty®
Shared: Action · FPS · Singleplayer