Games like Mayhem Brawler
Games like Mayhem Brawler include Streets of Rage 4, Teenage Mutant Ninja Turtles: Shredder's Revenge, Broforce, MARVEL Cosmic Invasion, and Fight'N Rage. We matched them by the tags players give Mayhem Brawler on Steam (Action, Beat 'em up, Side Scroller, Choose Your Own Adventure, and Arcade): closest matches first, and among equally close ones the better-known games.

Streets of Rage 4
Shared: Action · Beat 'em up · 2D

Teenage Mutant Ninja Turtles: Shredder's Revenge
Shared: Beat 'em up · Side Scroller · 2D

Broforce
Shared: Action · 2D · Co-op

MARVEL Cosmic Invasion
Shared: Beat 'em up · Arcade · Side Scroller

Fight'N Rage
Shared: Action · Beat 'em up · 2D

Castle Crashers®
Shared: Beat 'em up · 2D · Co-op

METAL SLUG
Shared: Action · Side Scroller · Arcade

Kung Fury: Street Rage - Ultimate Edition
Shared: Beat 'em up · Action · Arcade

Shank
Shared: Action · Beat 'em up · Side Scroller

METAL SLUG 3
Shared: Action · Arcade · Side Scroller

Shank 2
Shared: Action · Beat 'em up · 2D

Scott Pilgrim vs. The World™: The Game – Complete Edition
Shared: Action · Beat 'em up · 2D

Double Dragon: Neon
Shared: Beat 'em up · Action · Arcade

Absolum
Shared: Beat 'em up · Action · Side Scroller

METAL SLUG X
Shared: Action · Arcade · 2D

Bud Spencer & Terence Hill - Slaps And Beans
Shared: Action · Beat 'em up · Arcade

Dungeons & Dragons: Chronicles of Mystara
Shared: Beat 'em up · Action · Arcade

Capcom Beat 'Em Up Bundle
Shared: Beat 'em up · Action · Arcade

Guns, Gore & Cannoli
Shared: Action · Side Scroller · 2D

Sacred Citadel
Shared: Action · Beat 'em up · Side Scroller

METAL SLUG 2
Shared: Action · Side Scroller · Arcade

Phantom Breaker: Battle Grounds Classic
Shared: Beat 'em up · Action · Side Scroller

River City Girls
Shared: Action · Beat 'em up · 2D

Cuphead
Shared: Co-op · 2D · Action