Games like Indie Game Sim
Games like Indie Game Sim include Katana ZERO, Skul: The Hero Slayer, Broforce, Risk of Rain (2013), and Papers, Please. We matched them by the tags players give Indie Game Sim on Steam (Indie, Simulation, Action, Platformer, and Pixel Graphics): closest matches first, and among equally close ones the better-known games.

Katana ZERO
Shared: Action · Pixel Graphics · Platformer

Skul: The Hero Slayer
Shared: Indie · Action · Pixel Graphics

Broforce
Shared: Action · Pixel Graphics · Indie

Risk of Rain (2013)
Shared: Indie · Platformer · Action

Papers, Please
Shared: Indie · Simulation · Pixel Graphics

Shovel Knight: Treasure Trove
Shared: Platformer · Indie · Pixel Graphics

SANABI
Shared: Action · Pixel Graphics · Indie

Rogue Legacy
Shared: Indie · Platformer · Action

Celeste
Shared: Indie · Pixel Graphics · Platformer

KovaaK's
Shared: Action · Simulation · Indie

Pizza Tower
Shared: Indie · Platformer · Pixel Graphics

The Escapists
Shared: Pixel Graphics · Simulation · Indie

Hotline Miami
Shared: Indie · Action · Pixel Graphics

Axiom Verge
Shared: Indie · Platformer · Pixel Graphics

Out There Somewhere
Shared: Indie · Platformer · Pixel Graphics

Super Meat Boy
Shared: Indie · Platformer · Pixel Graphics

Gravity Circuit
Shared: Indie · Action · Platformer

Stardew Valley
Shared: Pixel Graphics · Simulation · Indie

MO:Astray
Shared: Indie · Action · Pixel Graphics

BlazBlue Entropy Effect
Shared: Action · Platformer · Pixel Graphics

Duck Game
Shared: Action · Pixel Graphics · Indie

Dungeon Munchies
Shared: Indie · Action · Pixel Graphics

Drug Dealer Simulator
Shared: Simulation · Indie · Action

Gato Roboto
Shared: Indie · Action · Pixel Graphics