Games like Arena Battle
Games like Arena Battle include Rogue Legacy 2, SANABI, Exit the Gungeon, Hollow Knight, and Dust: An Elysian Tail. We matched them by the tags players give Arena Battle on Steam (Adventure, Action, Arcade, Platformer, and 2D Platformer): closest matches first, and among equally close ones the better-known games.

Rogue Legacy 2
Shared: Arcade · Action · Platformer

SANABI
Shared: Action · Adventure · 2D Platformer

Exit the Gungeon
Shared: Arcade · Action · Adventure

Hollow Knight
Shared: Platformer · 2D · Adventure

Dust: An Elysian Tail
Shared: Action · Platformer · Adventure

Sonic Origins
Shared: Action · Adventure · 2D Platformer

Downwell
Shared: Platformer · Arcade · Action

Broforce
Shared: Action · Platformer · 2D

Katana ZERO
Shared: Action · Platformer · 2D Platformer

UFO 50
Shared: Action · Indie · Arcade

Shovel Knight: Treasure Trove
Shared: Platformer · Adventure · Action

Celeste
Shared: Platformer · 2D Platformer · Indie

Pizza Tower
Shared: 2D Platformer · Platformer · Indie

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

BEEP
Shared: Adventure · Platformer · Indie

Volgarr the Viking
Shared: Action · Platformer · Adventure

Hollow Knight: Silksong
Shared: Indie · 2D · Platformer

Super Mombo Quest
Shared: Adventure · Action · Arcade

Mark of the Ninja
Shared: Platformer · Action · Adventure

Trine 5: A Clockwork Conspiracy
Shared: Adventure · Action · Platformer

Spelunky
Shared: Platformer · Indie · 2D

Deadlight
Shared: Action · Platformer · Adventure

Sonic Superstars
Shared: Action · Adventure · Platformer

Rogue Legacy
Shared: Platformer · Action · Indie