Games like Spacegirl
Games like Spacegirl include Planet of Lana, Defy Gravity Extended, UFO 50, Webbed, and Öoo. We matched them by the tags players give Spacegirl on Steam (2D Platformer, Puzzle Platformer, Action, Puzzle, and Arcade): closest matches first, and among equally close ones the better-known games.

Planet of Lana
Shared: Puzzle Platformer · Action · 2D Platformer

Defy Gravity Extended
Shared: Puzzle Platformer · Puzzle · Action

UFO 50
Shared: Action · Arcade · 2D

Webbed
Shared: 2D Platformer · Puzzle Platformer · Pixel Graphics

Öoo
Shared: Puzzle Platformer · 2D Platformer · Puzzle

Celeste
Shared: 2D Platformer · Pixel Graphics · Female Protagonist

Portal
Shared: Puzzle Platformer · Puzzle · Female Protagonist

Braid
Shared: Puzzle Platformer · 2D Platformer · Puzzle

SANABI
Shared: Action · 2D Platformer · Pixel Graphics

ANTONBLAST
Shared: 2D Platformer · Action · 2D

Katana ZERO
Shared: Action · 2D Platformer · Pixel Graphics

ElecHead
Shared: Puzzle Platformer · Puzzle · Action

LIMBO
Shared: Puzzle Platformer · Puzzle · 2D

Portal 2
Shared: Puzzle · Puzzle Platformer · Female Protagonist

Out There Somewhere
Shared: Puzzle · Action · 2D

Gunpoint
Shared: Puzzle · 2D · Action

Vampire Survivors
Shared: 2D · Pixel Graphics · Action

ANIMAL WELL
Shared: Puzzle · Puzzle Platformer · Pixel Graphics

Door Kickers: Action Squad
Shared: 2D Platformer · Action · Pixel Graphics

The Escapists
Shared: Strategy · Action · 2D

Pizza Tower
Shared: 2D Platformer · Action · Indie

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

Exit the Gungeon
Shared: Action · Arcade · 2D Platformer

Moonleap
Shared: Puzzle Platformer · Puzzle · Strategy