Games like Plasma Spheres
Games like Plasma Spheres include Brawlhalla, Broforce, Stick Fight: The Game, Counter-Strike 2, and Duck Game. We matched them by the tags players give Plasma Spheres on Steam (Action, Arcade, Platformer, Shooter, and 2D Platformer): closest matches first, and among equally close ones the better-known games.

Brawlhalla
Shared: 2D Platformer · Platformer · Action

Broforce
Shared: Action · Platformer · Shooter

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

Counter-Strike 2
Shared: Shooter · Action · Multiplayer

Duck Game
Shared: Action · Platformer · Local Multiplayer

Gang Beasts
Shared: Action · Physics · Multiplayer

Move or Die
Shared: Action · Platformer · Local Multiplayer

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

PUBG: BATTLEGROUNDS
Shared: Shooter · Action · PvP

SpeedRunners
Shared: Action · Platformer · Indie

Battlefield™ 2042
Shared: Shooter · Action · Multiplayer

Call of Duty®
Shared: Action · Shooter · Multiplayer

Tom Clancy's Rainbow Six Siege
Shared: Shooter · PvP · Action

ROUNDS
Shared: Action · Local Multiplayer · Multiplayer

TEKKEN 7
Shared: Action · Arcade · Multiplayer

Rogue Legacy 2
Shared: Arcade · Action · Platformer

Battlefield™ 6
Shared: Action · Shooter · Multiplayer

TEKKEN 8
Shared: Action · Arcade · PvP

Rivals of Aether
Shared: Platformer · Indie · Action

My Friend Pedro
Shared: Action · Shooter · Indie

Counter-Strike: Source
Shared: Action · Shooter · PvP

Street Fighter™ 6
Shared: Arcade · Action · PvP

Battlefield™ 1
Shared: Action · Shooter · Multiplayer

Titanfall® 2
Shared: Shooter · Action · Multiplayer