Games like Ruin
Games like Ruin include Celeste, SANABI, Super Meat Boy, Downwell, and VVVVVV. We matched them by the tags players give Ruin on Steam (Precision Platformer, 2D Platformer, Parkour, Action, and Pixel Graphics): closest matches first, and among equally close ones the better-known games.

Celeste
Shared: Precision Platformer · Pixel Graphics · 2D Platformer

SANABI
Shared: Pixel Graphics · Action · 2D Platformer

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

Downwell
Shared: Precision Platformer · Pixel Graphics · 2D Platformer

VVVVVV
Shared: Precision Platformer · Pixel Graphics · 2D Platformer

Sonic Origins
Shared: 2D Platformer · Action · Pixel Graphics

Katana ZERO
Shared: Action · Pixel Graphics · 2D Platformer

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

Jump King
Shared: Precision Platformer · Pixel Graphics · Action

Sonic Superstars
Shared: 2D Platformer · Action · Platformer

Broforce
Shared: Action · Pixel Graphics · Platformer

Pizza Tower
Shared: 2D Platformer · Pixel Graphics · Platformer

Super Mombo Quest
Shared: Action · Precision Platformer · Adventure

Rusted Moss
Shared: Pixel Graphics · Action · Platformer

Ambidextro
Shared: Precision Platformer · 2D Platformer · Action

BlazBlue Entropy Effect
Shared: Action · Pixel Graphics · Platformer

Mina the Hollower
Shared: 2D Platformer · Pixel Graphics · Action-Adventure

Skul: The Hero Slayer
Shared: Action · Pixel Graphics · Platformer

UFO 50
Shared: Pixel Graphics · Action · Arcade

Super Fancy Pants Adventure
Shared: Action · Parkour · Adventure

Vampire Survivors
Shared: Pixel Graphics · Casual · Action

Brawlhalla
Shared: 2D Platformer · Casual · Platformer

The End Is Nigh
Shared: Precision Platformer · Platformer · Action

Webbed
Shared: 2D Platformer · Pixel Graphics · Platformer