Games like Freedom Planet 2
Games like Freedom Planet 2 include Celeste, Iconoclasts, Shovel Knight: Treasure Trove, SANABI, and Rabi-Ribi. We matched them by the tags players give Freedom Planet 2 on Steam (Platformer, Side Scroller, Female Protagonist, Pixel Graphics, and Action-Adventure): closest matches first, and among equally close ones the better-known games.

Celeste
Shared: Pixel Graphics · Platformer · Indie

Iconoclasts
Shared: Pixel Graphics · Female Protagonist · Indie

Shovel Knight: Treasure Trove
Shared: Platformer · Pixel Graphics · Indie

SANABI
Shared: Pixel Graphics · Platformer · Action

Rabi-Ribi
Shared: Female Protagonist · Pixel Graphics · Side Scroller

ICEY
Shared: Female Protagonist · Side Scroller · Action

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

Broforce
Shared: Pixel Graphics · Platformer · Action

Out There Somewhere
Shared: Platformer · Pixel Graphics · Indie

TEVI
Shared: Pixel Graphics · Female Protagonist · Action-Adventure

Sonic Mania
Shared: Platformer · Pixel Graphics · Side Scroller

Touhou Luna Nights
Shared: Side Scroller · Platformer · Female Protagonist

Momodora: Reverie Under The Moonlight
Shared: Side Scroller · Pixel Graphics · Female Protagonist

Momodora: Moonlit Farewell
Shared: Pixel Graphics · Side Scroller · Action-Adventure

Bloodstained: Curse of the Moon
Shared: Platformer · Pixel Graphics · Side Scroller

Freedom Planet
Shared: Platformer · Female Protagonist · Pixel Graphics

Bloodstained: Ritual of the Night
Shared: Female Protagonist · Side Scroller · Platformer

MO:Astray
Shared: Platformer · Indie · Pixel Graphics

BlazBlue Entropy Effect
Shared: Platformer · Action-Adventure · Pixel Graphics

Gato Roboto
Shared: Indie · Pixel Graphics · Platformer

Axiom Verge
Shared: Platformer · Pixel Graphics · Indie

9 Years of Shadows
Shared: Platformer · Side Scroller · Pixel Graphics

Mina the Hollower
Shared: Pixel Graphics · Action-Adventure · Female Protagonist

Portal 2
Shared: Platformer · Female Protagonist · Action-Adventure