Games like The Lost Soul
Games like The Lost Soul include Hollow Knight, Hollow Knight: Silksong, Celeste, Shovel Knight: Treasure Trove, and GRIS. We matched them by the tags players give The Lost Soul on Steam (Indie, Adventure, Casual, Platformer, and 2D): closest matches first, and among equally close ones the better-known games.

Hollow Knight
Shared: Platformer · Indie · 2D

Hollow Knight: Silksong
Shared: Indie · Difficult · 2D

Celeste
Shared: Indie · Pixel Graphics · Difficult

Shovel Knight: Treasure Trove
Shared: Platformer · Indie · Pixel Graphics

GRIS
Shared: Indie · Adventure · Great Soundtrack

Rain World
Shared: Indie · Difficult · Platformer

FEZ
Shared: Indie · Platformer · Pixel Graphics

Hyper Light Drifter
Shared: Indie · Adventure · Pixel Graphics

Geometry Dash
Shared: Difficult · 2D · Great Soundtrack

OneShot
Shared: Indie · Pixel Graphics · Great Soundtrack

Super Meat Boy
Shared: Indie · Platformer · Difficult

SANABI
Shared: Pixel Graphics · Adventure · Indie

The Binding of Isaac: Rebirth
Shared: Indie · Pixel Graphics · Difficult

Out There Somewhere
Shared: Indie · Platformer · Adventure

Jump King
Shared: Indie · Adventure · Difficult

LIMBO
Shared: Indie · Platformer · Adventure

To the Moon
Shared: Indie · Adventure · Great Soundtrack

Nihilumbra
Shared: Indie · Adventure · Platformer

BEEP
Shared: Indie · Adventure · Platformer

The End Is Nigh
Shared: Indie · Platformer · Adventure

Skul: The Hero Slayer
Shared: Indie · Pixel Graphics · 2D

Axiom Verge
Shared: Indie · Platformer · Pixel Graphics

Pizza Tower
Shared: Indie · Great Soundtrack · Platformer

Titan Souls
Shared: Indie · Adventure · Pixel Graphics