Games like EndGame - Costume1
Games like EndGame - Costume1 include Marvel Rivals, Neverwinter, Wuthering Waves, Idle Champions of the Forgotten Realms, and Warframe. We matched them by the tags players give EndGame - Costume1 on Steam (Action, Adventure, Free to Play, RPG, and Indie): closest matches first, and among equally close ones the better-known games.

Marvel Rivals
Shared: Free to Play · Action · Adventure

Neverwinter
Shared: Free to Play · RPG · Adventure

Wuthering Waves
Shared: Action · Free to Play · Adventure

Idle Champions of the Forgotten Realms
Shared: Free to Play · Adventure · Indie

Warframe
Shared: Free to Play · Action · RPG

Cat Quest
Shared: Adventure · RPG · Action

Once Human
Shared: Free to Play · Action · Adventure

Blue Protocol: Star Resonance
Shared: Action · Free to Play · Adventure

Honkai Impact 3rd
Shared: Action · Free to Play · Adventure

SMITE®
Shared: Free to Play · Action · Indie

Where Winds Meet
Shared: Free to Play · Adventure · RPG

Caster
Shared: Action · Adventure · Indie

Juicy Realm
Shared: Action · Adventure · Indie

G2 Fighter / 基因特工
Shared: Adventure · Action · RPG

Aimlabs
Shared: Free to Play · Action · Adventure

Notes of Soul
Shared: Action · Adventure · Indie

The First Descendant
Shared: Free to Play · Action · RPG

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

Bladed fury
Shared: Action · Adventure · Indie

Apex Legends™
Shared: Free to Play · Action · Adventure

SMITE 2
Shared: Action · Adventure · RPG

The Wind Road
Shared: Action · RPG · Adventure

NTE: Neverness to Everness
Shared: Free to Play · RPG · Adventure

Dungeon Munchies
Shared: Action · Adventure · Indie