Games like Portal Brawlers
Games like Portal Brawlers include Streets of Rage 4, Teenage Mutant Ninja Turtles: Shredder's Revenge, Dungeons & Dragons: Chronicles of Mystara, MARVEL Cosmic Invasion, and SANABI. We matched them by the tags players give Portal Brawlers on Steam (Beat 'em up, Arcade, Fantasy, Side Scroller, and 2D Platformer): closest matches first, and among equally close ones the better-known games.

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

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

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

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

SANABI
Shared: 2D Platformer · Story Rich · Action

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

Castle Crashers®
Shared: Beat 'em up · 2D · Action

Blasphemous 2
Shared: Fantasy · 2D Platformer · Side Scroller

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

Mayhem Brawler
Shared: Beat 'em up · Side Scroller · Arcade

Terminator 2D: NO FATE
Shared: Side Scroller · Arcade · 2D Platformer

METAL SLUG
Shared: Arcade · Side Scroller · 2D

METAL SLUG 3
Shared: Arcade · Side Scroller · Action

Dust: An Elysian Tail
Shared: Action · Fantasy · 2D

Shank
Shared: Beat 'em up · Side Scroller · 2D

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

Shower With Your Dad Simulator 2015: Do You Still Shower With Your Dad
Shared: Arcade · 2D · Story Rich

The Legend of Tianding
Shared: Beat 'em up · Controller · Side Scroller

Lost Castle
Shared: Beat 'em up · Side Scroller · Dungeon Crawler

Shovel Knight: Treasure Trove
Shared: 2D · Side Scroller · Fantasy

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

Injustice: Gods Among Us Ultimate Edition
Shared: Action · Arcade · Beat 'em up

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

Double Dragon: Neon
Shared: Beat 'em up · Arcade · Side Scroller