Games like Cowboy's Adventure
Games like Cowboy's Adventure include Hollow Knight, Hollow Knight: Silksong, Getting Over It with Bennett Foddy, BEEP, and Ori and the Will of the Wisps. We matched them by the tags players give Cowboy's Adventure on Steam (Indie, Action, Adventure, Casual, and Difficult): closest matches first, and among equally close ones the better-known games.

Hollow Knight
Shared: Indie · Difficult · Platformer

Hollow Knight: Silksong
Shared: Indie · Difficult · Singleplayer

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

BEEP
Shared: Indie · Adventure · Action

Ori and the Will of the Wisps
Shared: Action · Adventure · Singleplayer

Celeste
Shared: Indie · Difficult · Great Soundtrack

Hyper Light Drifter
Shared: Indie · Adventure · Action

GRIS
Shared: Indie · Adventure · Great Soundtrack

Geometry Dash
Shared: Difficult · Singleplayer · Great Soundtrack

Gang Beasts
Shared: Action · Casual · Indie

Totally Accurate Battle Simulator
Shared: Simulation · Indie · Singleplayer

Minimalism
Shared: Indie · Action · Casual

A Dance of Fire and Ice
Shared: Indie · Difficult · Singleplayer

Seen
Shared: Indie · Adventure · Singleplayer

SANABI
Shared: Action · Adventure · Indie

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

Pumpkin Jack
Shared: Action · Adventure · Indie

LIMBO
Shared: Indie · Adventure · Platformer

Shio
Shared: Indie · Action · Casual

Nihilumbra
Shared: Indie · Adventure · Casual

Bastion
Shared: Indie · Action · Singleplayer

Slime Rancher
Shared: Adventure · Singleplayer · Casual

BONEWORKS
Shared: Action · Physics · Singleplayer

Rain World
Shared: Indie · Difficult · Atmospheric