Games like Star Girl Proxima
Games like Star Girl Proxima include Celeste, Rabi-Ribi, Shovel Knight: Treasure Trove, ICEY, and SANABI. We matched them by the tags players give Star Girl Proxima on Steam (Indie, Action, Female Protagonist, Platformer, and Retro): closest matches first, and among equally close ones the better-known games.

Celeste
Shared: Indie · Platformer · Pixel Graphics

Rabi-Ribi
Shared: Female Protagonist · Anime · Indie

Shovel Knight: Treasure Trove
Shared: Platformer · Indie · Retro

ICEY
Shared: Action · Female Protagonist · Indie

SANABI
Shared: Action · Pixel Graphics · Indie

Dungeon Munchies
Shared: Indie · Action · Pixel Graphics

Bloodstained: Curse of the Moon
Shared: Action · Platformer · Retro

Freedom Planet
Shared: Action · Platformer · Female Protagonist

Hollow Knight: Silksong
Shared: Indie · Platformer · Female Protagonist

Super Meat Boy
Shared: Indie · Platformer · Pixel Graphics

Skul: The Hero Slayer
Shared: Indie · Action · Pixel Graphics

Bloodstained: Ritual of the Night
Shared: Female Protagonist · Action · Anime

Katana ZERO
Shared: Action · Pixel Graphics · Platformer

Pizza Tower
Shared: Indie · Platformer · Action

Broforce
Shared: Action · Pixel Graphics · Indie

The Messenger
Shared: Platformer · Retro · Indie

Vampire Survivors
Shared: Indie · Pixel Graphics · Bullet Hell

VVVVVV
Shared: Indie · Platformer · Pixel Graphics

Planet of Lana
Shared: Action · Female Protagonist · Platformer

Gato Roboto
Shared: Indie · Action · Pixel Graphics

Touhou Hero of Ice Fairy
Shared: Female Protagonist · Anime · Indie

Angry Video Game Nerd Adventures
Shared: Indie · Action · Platformer

Out There Somewhere
Shared: Indie · Platformer · Pixel Graphics

UBERMOSH
Shared: Action · Indie · Pixel Graphics