Games like Cat Adventure 2
Games like Cat Adventure 2 include Celeste, Chained Together, Hollow Knight: Silksong, Hollow Knight, and LIMBO. We matched them by the tags players give Cat Adventure 2 on Steam (Indie, Casual, Adventure, Platformer, and Precision Platformer): closest matches first, and among equally close ones the better-known games.

Celeste
Shared: Indie · Precision Platformer · Difficult

Chained Together
Shared: Adventure · Casual · Platformer

Hollow Knight: Silksong
Shared: Indie · Difficult · Platformer

Hollow Knight
Shared: Platformer · Indie · Difficult

LIMBO
Shared: Indie · Platformer · Puzzle Platformer

GRIS
Shared: Indie · Adventure · Platformer

FEZ
Shared: Indie · Platformer · Adventure

Nihilumbra
Shared: Indie · Adventure · Platformer

Super Meat Boy
Shared: Indie · Platformer · Precision Platformer

Geometry Dash
Shared: Difficult · Precision Platformer · Platformer

Portal 2
Shared: Platformer · Singleplayer · Puzzle Platformer

Jump King
Shared: Indie · Precision Platformer · Difficult

Getting Over It with Bennett Foddy
Shared: Difficult · Indie · Singleplayer

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

A Story About My Uncle
Shared: Adventure · Indie · Platformer

Kao the Kangaroo: Round 2 (2003 re-release)
Shared: Adventure · Casual · Platformer

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

Squishy the Suicidal Pig
Shared: Indie · Platformer · Adventure

Defy Gravity Extended
Shared: Indie · Platformer · Puzzle Platformer

Minimalism
Shared: Indie · Casual · Platformer

BEEP
Shared: Indie · Adventure · Platformer

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

A Difficult Game About Climbing
Shared: Adventure · Difficult · Platformer

Get To Work
Shared: Adventure · Difficult · Precision Platformer