Games like JustBox
Games like JustBox include Brawlhalla, Warframe, SANABI, GrandChase, and Gravity Circuit. We matched them by the tags players give JustBox on Steam (Action, 2D Platformer, 2D, Sci-fi, and PvE): closest matches first, and among equally close ones the better-known games.

Brawlhalla
Shared: 2D Platformer · Free to Play · Action

Warframe
Shared: Action · Free to Play · PvE

SANABI
Shared: Action · 2D Platformer · 2D

GrandChase
Shared: Action · PvE · Free to Play

Gravity Circuit
Shared: Action · 2D · 2D Platformer

Risk of Rain Returns
Shared: 2D · PvE · Action

Halo Infinite
Shared: Action · Free to Play · Sci-fi

Katana ZERO
Shared: Action · 2D Platformer · 2D

Super Meat Boy
Shared: 2D Platformer · 2D · Indie

Vampire Survivors
Shared: 2D · Action · Indie

ANTONBLAST
Shared: 2D Platformer · Action · 2D

Pizza Tower
Shared: 2D Platformer · Indie · Action

Endless Sky
Shared: Sci-fi · 2D · Free to Play

HELLDIVERS™ 2
Shared: PvE · Action · Sci-fi

SUPERHOT
Shared: Action · Bullet Time · Indie

Warhammer 40,000: Space Marine 2
Shared: Action · PvE · Sci-fi

Planet of Lana
Shared: Action · 2D Platformer · Singleplayer

Awesomenauts
Shared: 2D · Action · Indie

Aimlabs
Shared: Action · Free to Play · Controller

My Friend Pedro
Shared: Action · Indie · Bullet Time

Have a Nice Death
Shared: 2D · Action · 2D Platformer

Janosik
Shared: Action · 2D Platformer · 2D

Predecessor
Shared: Action · Sci-fi · PvE

Skul: The Hero Slayer
Shared: Action · 2D · Indie