Games like Nidhogg 2
Games like Nidhogg 2 include Stick Fight: The Game, Brawlhalla, Rivals of Aether, Duck Game, and Broforce. We matched them by the tags players give Nidhogg 2 on Steam (Local Multiplayer, Indie, Action, Fighting, and Casual): closest matches first, and among equally close ones the better-known games.

Stick Fight: The Game
Shared: Local Multiplayer · Fighting · Multiplayer

Brawlhalla
Shared: Fighting · Multiplayer · Local Multiplayer

Rivals of Aether
Shared: Fighting · Indie · Local Multiplayer

Duck Game
Shared: Local Multiplayer · Multiplayer · Action

Broforce
Shared: Action · Pixel Graphics · Indie

Gang Beasts
Shared: Action · Local Multiplayer · Multiplayer

Mortal Kombat 11
Shared: Fighting · Action · Local Multiplayer

ROUNDS
Shared: Local Multiplayer · Fighting · Multiplayer

Nidhogg
Shared: Local Multiplayer · Indie · Pixel Graphics

Mortal Kombat X
Shared: Fighting · Action · Local Multiplayer

Move or Die
Shared: Local Multiplayer · Action · Multiplayer

Party Animals
Shared: Multiplayer · Casual · Fighting

Timberman
Shared: Indie · Casual · Action

SpiderHeck
Shared: Local Multiplayer · Fighting · Funny

SpeedRunners
Shared: Local Multiplayer · Indie · Multiplayer

Superfighters Deluxe
Shared: Action · Indie · Multiplayer

Clone Drone in the Danger Zone
Shared: Action · Fighting · Indie

A Few Quick Matches
Shared: Indie · Fighting · Casual

Rivals of Aether II
Shared: Fighting · Indie · Local Multiplayer

TowerFall Ascension
Shared: Local Multiplayer · Indie · Action

Lethal League
Shared: Local Multiplayer · Indie · Fighting

DRAGON BALL FighterZ
Shared: Fighting · Action · Local Multiplayer

Mortal Kombat 1
Shared: Action · Fighting · Multiplayer

Streets of Rage 4
Shared: Indie · Action · Local Multiplayer