Games like Royal Vermin
Games like Royal Vermin include Stick Fight: The Game, Brawlhalla, Move or Die, Rivals of Aether, and SpiderHeck. We matched them by the tags players give Royal Vermin on Steam (Local Multiplayer, 2D Fighter, 4 Player Local, Platformer, and Casual): closest matches first, and among equally close ones the better-known games.

Stick Fight: The Game
Shared: Local Multiplayer · 2D Fighter · 4 Player Local

Brawlhalla
Shared: 2D Fighter · Local Multiplayer · Casual

Move or Die
Shared: Local Multiplayer · 4 Player Local · Funny

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

SpiderHeck
Shared: Local Multiplayer · 2D Fighter · PvP

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

Duck Game
Shared: Local Multiplayer · 4 Player Local · Platformer

SpeedRunners
Shared: Local Multiplayer · Platformer · 4 Player Local

ROUNDS
Shared: Local Multiplayer · 2D Fighter · PvP

Gang Beasts
Shared: Local Multiplayer · Casual · Physics

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

Bopl Battle
Shared: 2D Fighter · 4 Player Local · Local Multiplayer

Ultimate Chicken Horse
Shared: Local Multiplayer · Platformer · PvP

BattleBlock Theater®
Shared: Platformer · Local Multiplayer · Funny

Rivals of Aether II
Shared: 2D Fighter · Local Multiplayer · 4 Player Local

Castle Crashers®
Shared: 4 Player Local · 2D · Local Multiplayer

GUILTY GEAR -STRIVE-
Shared: 2D Fighter · PvP · Arcade

Broforce
Shared: Platformer · Local Multiplayer · 2D

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

Overcooked! 2
Shared: Local Multiplayer · Casual · 4 Player Local

A Few Quick Matches
Shared: 2D Fighter · 4 Player Local · Casual

Pummel Party
Shared: 4 Player Local · Local Multiplayer · Funny

Party Animals
Shared: Casual · PvP · Local Multiplayer

Tricky Towers
Shared: Local Multiplayer · Casual · Physics