Games like PAIN
Games like PAIN include Celeste, Super Meat Boy, Geometry Dash, Pizza Tower, and Jump King. We matched them by the tags players give PAIN on Steam (Difficult, Precision Platformer, Colorful, 2D Platformer, and Cartoony): closest matches first, and among equally close ones the better-known games.

Celeste
Shared: Difficult · Precision Platformer · 2D Platformer

Super Meat Boy
Shared: Precision Platformer · Difficult · 2D Platformer

Geometry Dash
Shared: Difficult · Precision Platformer · Colorful

Pizza Tower
Shared: 2D Platformer · Cartoony · Indie

Jump King
Shared: Difficult · Precision Platformer · Indie

SANABI
Shared: 2D Platformer · Action · Adventure

Super Meat Boy Forever
Shared: Difficult · Precision Platformer · Action

N++ (NPLUSPLUS)
Shared: Precision Platformer · Difficult · 2D Platformer

VVVVVV
Shared: Precision Platformer · Difficult · 2D Platformer

Downwell
Shared: Precision Platformer · Difficult · 2D Platformer

Pogostuck: Rage With Your Friends
Shared: Difficult · Precision Platformer · Action

The End Is Nigh
Shared: Precision Platformer · Difficult · Indie

Prince of Persia The Lost Crown
Shared: 2D Platformer · Precision Platformer · Action

Pumpkin Jack
Shared: Colorful · Action · Adventure

Alex Kidd in Miracle World DX
Shared: Precision Platformer · Difficult · 2D Platformer

I wanna be the Creator
Shared: Action · Difficult · Precision Platformer

Garbanzo Quest
Shared: 2D Platformer · Precision Platformer · Indie

Hollow Knight: Silksong
Shared: Difficult · Indie · Adventure

Windswept
Shared: Difficult · 2D Platformer · Precision Platformer

Hyper Light Drifter
Shared: Difficult · Adventure · Indie

Rogue Legacy 2
Shared: Action · Difficult · Indie

Blasphemous 2
Shared: Difficult · 2D Platformer · Adventure

Cuphead
Shared: Difficult · Indie · Cartoony

Crash Bandicoot™ 4: It’s About Time
Shared: Difficult · Action · Cartoony