Games like The Warrior
Games like The Warrior include Celeste, SANABI, Portal 2, OneShot, and Webbed. We matched them by the tags players give The Warrior on Steam (Precision Platformer, Pixel Graphics, Cute, Adventure, and Dark Humor): closest matches first, and among equally close ones the better-known games.

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

SANABI
Shared: Pixel Graphics · Story Rich · Adventure

Portal 2
Shared: Dark Humor · Singleplayer · Story Rich

OneShot
Shared: Pixel Graphics · Cute · Story Rich

Webbed
Shared: Pixel Graphics · Cute · 2D Platformer

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

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

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

Jump King
Shared: Precision Platformer · Pixel Graphics · Adventure

Owlboy
Shared: Pixel Graphics · Adventure · Story Rich

MO:Astray
Shared: Pixel Graphics · Adventure · Cute

To the Moon
Shared: Pixel Graphics · Story Rich · Adventure

Katana ZERO
Shared: Pixel Graphics · Story Rich · 2D Platformer

Iconoclasts
Shared: Pixel Graphics · Adventure · Story Rich

Undertale
Shared: Pixel Graphics · Story Rich · Singleplayer

Eastward
Shared: Pixel Graphics · Adventure · Story Rich

CATO: Buttered Cat
Shared: Cute · Adventure · Pixel Graphics

Outcore: Desktop Adventure
Shared: Adventure · Story Rich · Cute

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

INMOST
Shared: Pixel Graphics · Adventure · Story Rich

Prince of Persia The Lost Crown
Shared: Precision Platformer · Adventure · Side Scroller

Will You Snail?
Shared: Precision Platformer · Story Rich · 2D Platformer

Tomb Raider Game of the Year
Shared: Adventure · Story Rich · Singleplayer

Momodora: Reverie Under The Moonlight
Shared: Pixel Graphics · Side Scroller · 2D Platformer