Games like Plasmarena
Games like Plasmarena include UpGun, Stick Fight: The Game, ShellShock Live, PUBG: BATTLEGROUNDS, and Broforce. We matched them by the tags players give Plasmarena on Steam (Multiplayer, Arcade, Action, 2D, and Top-Down Shooter): closest matches first, and among equally close ones the better-known games.

UpGun
Shared: Multiplayer · PvP · Arcade

Stick Fight: The Game
Shared: Multiplayer · Action · PvP

ShellShock Live
Shared: Multiplayer · Action · 2D

PUBG: BATTLEGROUNDS
Shared: Multiplayer · PvP · Action

Broforce
Shared: Action · 2D · Multiplayer

Apex Legends™
Shared: Multiplayer · PvP · Action

Pixel Gun 3D: PC Edition
Shared: PvP · Multiplayer · Action

Streets of Rage 4
Shared: Action · 2D · Arcade

THE FINALS
Shared: Multiplayer · PvP · Action

Grand Theft Auto V Legacy
Shared: Multiplayer · Action · PvP

Deployment
Shared: Multiplayer · Top-Down Shooter · Action

Marvel Rivals
Shared: Multiplayer · PvP · Action

Apewar
Shared: Action · Multiplayer · PvP

Duck Game
Shared: Multiplayer · Action · 2D

Paladins®
Shared: Multiplayer · Action · PvP

Move or Die
Shared: Multiplayer · Action · 2D

Ninja Kiwi Archive
Shared: Arcade · Action · Multiplayer

WARDOGS
Shared: Multiplayer · PvP · Action

Among Us
Shared: Multiplayer · 2D · PvP

Strike Force Heroes
Shared: Action · 2D · Multiplayer

Gang Beasts
Shared: Multiplayer · Action · PvP

ARC Raiders
Shared: Multiplayer · PvP · Shooter

JoJo's Bizarre Adventure: All-Star Battle R
Shared: PvP · Action · Multiplayer

Titanfall® 2
Shared: Multiplayer · Action · PvP