Games like Marblous
Games like Marblous include Celeste, Super Meat Boy, Thomas Was Alone, Geometry Dash, and Only Climb: Better Together. We matched them by the tags players give Marblous on Steam (Precision Platformer, Side Scroller, 2D Platformer, Runner, and 3D Platformer): closest matches first, and among equally close ones the better-known games.

Celeste
Shared: Precision Platformer · 2D Platformer · Platformer

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

Thomas Was Alone
Shared: Side Scroller · Precision Platformer · 2D Platformer

Geometry Dash
Shared: Precision Platformer · Platformer · Character Customization

Only Climb: Better Together
Shared: Precision Platformer · 3D Platformer · Platformer

Super Meat Boy Forever
Shared: Precision Platformer · Runner · Platformer

SANABI
Shared: 2D Platformer · Action · Platformer

OlliOlli World
Shared: Precision Platformer · 2D Platformer · 3D Platformer

SONIC X SHADOW GENERATIONS
Shared: 3D Platformer · Platformer · 2D Platformer

VVVVVV
Shared: Precision Platformer · 2D Platformer · Platformer

BIT.TRIP Presents... Runner2: Future Legend of Rhythm Alien
Shared: Precision Platformer · Side Scroller · Runner

Prince of Persia The Lost Crown
Shared: 2D Platformer · Side Scroller · Precision Platformer

Downwell
Shared: Precision Platformer · 2D Platformer · Platformer

Neon White
Shared: 3D Platformer · Platformer · Precision Platformer

VHOLUME
Shared: Runner · 3D Platformer · Platformer

BIT.TRIP RERUNNER
Shared: Precision Platformer · Side Scroller · Runner

Soda Crisis
Shared: Side Scroller · Runner · Platformer

!AnyWay!
Shared: Precision Platformer · Side Scroller · 2D Platformer

Bō: Path of the Teal Lotus
Shared: Precision Platformer · Side Scroller · 2D Platformer

ALTF4
Shared: Runner · 3D Platformer · Platformer

Ambidextro
Shared: Precision Platformer · 2D Platformer · Platformer

The Pedestrian
Shared: Side Scroller · 2D Platformer · Platformer

Spelunky 2
Shared: 2D Platformer · Platformer · Procedural Generation

NINJA GAIDEN: Ragebound
Shared: 2D Platformer · Side Scroller · Platformer