Games like Krimson
Games like Krimson include Celeste, Geometry Dash, Jump King, Little Nightmares II, and Little Nightmares. We matched them by the tags players give Krimson on Steam (Precision Platformer, Rhythm, Horror, Psychological Horror, and 2D Platformer): closest matches first, and among equally close ones the better-known games.

Celeste
Shared: Precision Platformer · Platformer · 2D Platformer

Geometry Dash
Shared: Rhythm · Precision Platformer · 2D

Jump King
Shared: Precision Platformer · Psychological Horror · Platformer

Little Nightmares II
Shared: Horror · Psychological Horror · Dark

Little Nightmares
Shared: Horror · Atmospheric · Dark

LIMBO
Shared: Platformer · Dark · Horror

Sally Face - Episode One
Shared: Psychological Horror · Horror · Dark

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

DISTRAINT: Deluxe Edition
Shared: Horror · Psychological Horror · 2D

Fran Bow
Shared: Psychological Horror · Horror · Dark

SOMA
Shared: Horror · Psychological Horror · Atmospheric

Firework
Shared: Horror · Psychological Horror · 2D

Poppy Playtime
Shared: Horror · Psychological Horror · Dark

Outlast
Shared: Horror · Psychological Horror · Atmospheric

INSIDE
Shared: Horror · Dark · Atmospheric

VVVVVV
Shared: Precision Platformer · Platformer · 2D Platformer

SANABI
Shared: 2D Platformer · 2D · Action

Darkwood
Shared: Horror · Psychological Horror · Dark

Layers of Fear (2016)
Shared: Horror · Psychological Horror · Atmospheric

Amnesia: The Dark Descent
Shared: Horror · Psychological Horror · Atmospheric

Pony Island
Shared: Psychological Horror · Horror · Puzzle

Detention
Shared: Horror · Psychological Horror · Atmospheric

ANIMAL WELL
Shared: Horror · Platformer · 2D

The End Is Nigh
Shared: Precision Platformer · Platformer · 2D