Games like The Lightseeker
Games like The Lightseeker include Celeste, Portal 2, GRIS, LIMBO, and Hollow Knight: Silksong. We matched them by the tags players give The Lightseeker on Steam (Adventure, Platformer, Puzzle Platformer, PvE, and Tutorial): closest matches first, and among equally close ones the better-known games.

Celeste
Shared: Platformer · Precision Platformer · Female Protagonist

Portal 2
Shared: Platformer · Puzzle Platformer · Female Protagonist

GRIS
Shared: Adventure · Platformer · Female Protagonist

LIMBO
Shared: Puzzle Platformer · Platformer · Adventure

Hollow Knight: Silksong
Shared: Platformer · 2D · Adventure

Hollow Knight
Shared: Platformer · 2D · Adventure

Iconoclasts
Shared: Adventure · Female Protagonist · Platformer

Owlboy
Shared: Adventure · Platformer · 2D

Little Nightmares
Shared: Adventure · Puzzle Platformer · Platformer

SANABI
Shared: Adventure · Story Rich · Platformer

Neva
Shared: Adventure · Platformer · Female Protagonist

Planet of Lana
Shared: Puzzle Platformer · Female Protagonist · Platformer

Never Alone (Kisima Ingitchuna)
Shared: Platformer · Adventure · Female Protagonist

INSIDE
Shared: Puzzle Platformer · Adventure · Story Rich

MO:Astray
Shared: Adventure · Puzzle Platformer · Platformer

FEZ
Shared: Platformer · Adventure · Puzzle Platformer

Contrast
Shared: Adventure · Female Protagonist · Platformer

Phoenotopia: Awakening
Shared: Adventure · Platformer · Puzzle Platformer

ANIMAL WELL
Shared: Puzzle Platformer · Platformer · Adventure

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

Out There Somewhere
Shared: Platformer · Adventure · 2D

Nihilumbra
Shared: Adventure · Platformer · Puzzle Platformer

Öoo
Shared: Puzzle Platformer · Platformer · 2D

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