Games like Arch Rivals
Games like Arch Rivals include Brawlhalla, Stick Fight: The Game, ROUNDS, Broforce, and Super Meat Boy. We matched them by the tags players give Arch Rivals on Steam (Precision Platformer, 2D Fighter, Side Scroller, Action, and Physics): closest matches first, and among equally close ones the better-known games.

Brawlhalla
Shared: 2D Fighter · 2D Platformer · Local Multiplayer

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

ROUNDS
Shared: 2D Fighter · Local Multiplayer · Action

Broforce
Shared: Action · Side Scroller · 2D

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

Rivals of Aether
Shared: 2D Fighter · Local Multiplayer · Platformer

Celeste
Shared: Precision Platformer · 2D Platformer · Platformer

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

TowerFall Ascension
Shared: 2D Fighter · Action · Local Multiplayer

SANABI
Shared: Action · 2D Platformer · Pixel Graphics

Rivals of Aether II
Shared: 2D Fighter · Action · Local Multiplayer

DRAGON BALL FighterZ
Shared: 2D Fighter · Action · Local Multiplayer

Duck Game
Shared: Action · Local Multiplayer · 2D

Anomaly Agent
Shared: Side Scroller · 2D Fighter · 2D Platformer

Shovel Knight: Treasure Trove
Shared: Platformer · Action · Side Scroller

SpiderHeck
Shared: 2D Fighter · Physics · Local Multiplayer

VVVVVV
Shared: Precision Platformer · Platformer · 2D Platformer

Streets of Rage 4
Shared: Action · Side Scroller · Local Multiplayer

20XX
Shared: Action · Platformer · 2D Platformer

Downwell
Shared: Precision Platformer · Action · Platformer

Gravity Circuit
Shared: Action · Platformer · 2D Platformer

Street Fighter™ 6
Shared: 2D Fighter · Action · PvP

Ambidextro
Shared: Precision Platformer · Action · 2D Platformer

Jump King
Shared: Precision Platformer · Action · Platformer