Games like Eternal Dungeon
Games like Eternal Dungeon include Eastern Exorcist, Dust: An Elysian Tail, SHINOBI: Art of Vengeance, ICEY, and Skul: The Hero Slayer. We matched them by the tags players give Eternal Dungeon on Steam (Action, Platformer, Runner, Side Scroller, and 2D): closest matches first, and among equally close ones the better-known games.

Eastern Exorcist
Shared: Action · Side Scroller · 2D

Dust: An Elysian Tail
Shared: Action · Platformer · 2D

SHINOBI: Art of Vengeance
Shared: Action · Platformer · 2D

ICEY
Shared: Action · Side Scroller · Hack and Slash

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

Cuphead
Shared: Platformer · Cartoon · 2D

Mark of the Ninja
Shared: Platformer · Action · 2D

SANABI
Shared: Action · 2D · Platformer

Shovel Knight: Treasure Trove
Shared: Platformer · Action · 2D

Broforce
Shared: Action · Platformer · 2D

Rogue Legacy 2
Shared: Platformer · Action · 2D

Castlevania: Lords of Shadow – Mirror of Fate HD
Shared: Action · Platformer · Adventure

Sonic Mania
Shared: Platformer · 2D · Action

Rogue Legacy
Shared: Platformer · Action · 2D

The Vagrant
Shared: Action · 2D · Side Scroller

Sonic Superstars
Shared: Action · Platformer · 2D

Super Meat Boy Forever
Shared: Action · Platformer · Runner

Bloodstained: Curse of the Moon
Shared: Action · Platformer · 2D

Super Fancy Pants Adventure
Shared: Action · Platformer · 2D

Monster Boy and the Cursed Kingdom
Shared: Action · Platformer · 2D

Hollow Knight
Shared: Platformer · 2D · Action

Blasphemous 2
Shared: Fantasy · Side Scroller · Platformer

Anomaly Agent
Shared: Side Scroller · Platformer · Hack and Slash

Ori and the Will of the Wisps
Shared: Platformer · Action · Adventure