Games like Auxin
Games like Auxin include Rivals of Aether, Broforce, Celeste, Super Meat Boy, and Shovel Knight: Treasure Trove. We matched them by the tags players give Auxin on Steam (Action, Indie, 2D Fighter, Platformer, and Precision Platformer): closest matches first, and among equally close ones the better-known games.

Rivals of Aether
Shared: 2D Fighter · Indie · Pixel Graphics

Broforce
Shared: Action · Pixel Graphics · Platformer

Celeste
Shared: Precision Platformer · Indie · Platformer

Super Meat Boy
Shared: Indie · Platformer · Precision Platformer

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

Duck Game
Shared: Action · Pixel Graphics · Indie

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

TowerFall Ascension
Shared: Indie · Action · 2D Fighter

Katana ZERO
Shared: Action · Pixel Graphics · Platformer

Jump King
Shared: Indie · Precision Platformer · Action

VVVVVV
Shared: Indie · Platformer · Precision Platformer

BlazBlue Entropy Effect
Shared: Action · 2D · Platformer

Stick Fight: The Game
Shared: Action · 2D Fighter · 2D

SANABI
Shared: Action · Pixel Graphics · Indie

Downwell
Shared: Indie · Precision Platformer · Platformer

Gato Roboto
Shared: Indie · Action · Pixel Graphics

Your Only Move Is HUSTLE
Shared: Action · 2D Fighter · 2D

Gravity Circuit
Shared: Action · Indie · Platformer

Brawlhalla
Shared: 2D Fighter · Platformer · Action

The Messenger
Shared: Platformer · Indie · Action

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

UFO 50
Shared: Indie · Action · Pixel Graphics

Stick It to the Stickman
Shared: Action · 2D Fighter · Indie

Freedom Planet
Shared: Action · Platformer · Indie