Games like Cosmic Pebble
Games like Cosmic Pebble include Celeste, SANABI, Katana ZERO, Super Meat Boy, and Dome Keeper. We matched them by the tags players give Cosmic Pebble on Steam (Precision Platformer, Pixel Graphics, Action, Sci-fi, and Atmospheric): closest matches first, and among equally close ones the better-known games.

Celeste
Shared: Precision Platformer · Pixel Graphics · Indie

SANABI
Shared: Pixel Graphics · Action · Story Rich

Katana ZERO
Shared: Pixel Graphics · Action · Story Rich

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

Dome Keeper
Shared: Action · Sci-fi · Pixel Graphics

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

Eastward
Shared: Pixel Graphics · Story Rich · Atmospheric

Thomas Was Alone
Shared: Precision Platformer · Sci-fi · Atmospheric

The Final Station
Shared: Pixel Graphics · Action · Post-apocalyptic

MO:Astray
Shared: Action · Pixel Graphics · Sci-fi

Half-Life 2
Shared: Action · Sci-fi · Story Rich

METRO Last Light Redux
Shared: Action · Atmospheric · Story Rich

Hyper Light Drifter
Shared: Pixel Graphics · Atmospheric · Action

Deliver Us The Moon
Shared: Action · Sci-fi · Atmospheric

Iconoclasts
Shared: Pixel Graphics · Action · Story Rich

Rain World
Shared: Atmospheric · Pixel Graphics · Indie

Rusted Moss
Shared: Pixel Graphics · Action · Precision Platformer

Jump King
Shared: Precision Platformer · Pixel Graphics · Action

Downwell
Shared: Precision Platformer · Pixel Graphics · Action

OneShot
Shared: Pixel Graphics · Story Rich · Atmospheric

Mass Effect™ Legendary Edition
Shared: Story Rich · Sci-fi · Action

Black Mesa
Shared: Action · Sci-fi · Atmospheric

METRO 2033 Redux
Shared: Atmospheric · Action · Story Rich

Fallout 4
Shared: Post-apocalyptic · Atmospheric · Action