Games like The Evil Party
Games like The Evil Party include Hollow Knight, Hollow Knight: Silksong, Nine Sols, Skul: The Hero Slayer, and Shovel Knight: Treasure Trove. We matched them by the tags players give The Evil Party on Steam (Adventure, Indie, Action, Platformer, and 2D): closest matches first, and among equally close ones the better-known games.

Hollow Knight
Shared: Platformer · Indie · Difficult

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

Nine Sols
Shared: Platformer · 2D · Action

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

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

Celeste
Shared: Indie · Difficult · Platformer

Jump King
Shared: Indie · Adventure · Difficult

Rogue Legacy 2
Shared: Action · Platformer · Indie

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

SANABI
Shared: Action · Adventure · Indie

BEEP
Shared: Indie · Adventure · Platformer

Cuphead
Shared: Difficult · Platformer · Indie

LIMBO
Shared: Indie · Platformer · Adventure

Angvik
Shared: Indie · Action · Platformer

Rain World
Shared: Indie · Difficult · Platformer

Angry Video Game Nerd Adventures
Shared: Indie · Platformer · Action

BADLAND: Game of the Year Edition
Shared: Adventure · Indie · Action

Spelunky
Shared: Platformer · Indie · 2D

Out There Somewhere
Shared: Indie · Platformer · Adventure

Minimalism
Shared: Indie · Action · Adventure

Zombotron
Shared: Adventure · Action · Indie

Geometry Dash
Shared: Difficult · 2D · Platformer

Broforce
Shared: Action · 2D · Platformer

The End Is Nigh
Shared: Indie · Platformer · Adventure