Games like Fallen Rebellion
Games like Fallen Rebellion include Celeste, Prince of Persia The Lost Crown, Rogue Legacy 2, Bloodstained: Ritual of the Night, and F.I.S.T.: Forged In Shadow Torch. We matched them by the tags players give Fallen Rebellion on Steam (2.5D, Precision Platformer, Platformer, Adventure, and 3D Platformer): closest matches first, and among equally close ones the better-known games.

Celeste
Shared: Precision Platformer · Platformer · 2D Platformer

Prince of Persia The Lost Crown
Shared: Precision Platformer · Metroidvania · Adventure

Rogue Legacy 2
Shared: Platformer · Metroidvania · Arcade

Bloodstained: Ritual of the Night
Shared: Adventure · 2.5D · Metroidvania

F.I.S.T.: Forged In Shadow Torch
Shared: Platformer · Adventure · Metroidvania

Hollow Knight
Shared: Platformer · Metroidvania · Adventure

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

The Darkest Tales — Into the Nightmare
Shared: Platformer · Adventure · 2.5D

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

Geometry Dash
Shared: Precision Platformer · Platformer · Colorful

Downwell
Shared: Precision Platformer · Platformer · 2D Platformer

Super Mombo Quest
Shared: Adventure · Precision Platformer · Platformer

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

Sonic the Hedgehog 4 Episode 1
Shared: Platformer · Adventure · 2.5D

Pogostuck: Rage With Your Friends
Shared: Precision Platformer · Platformer · Adventure

STRIDER
Shared: Platformer · 2.5D · Metroidvania

Hollow Knight: Silksong
Shared: Metroidvania · Platformer · Adventure

Possessor(s)
Shared: Platformer · Adventure · Side Scroller

Momodora: Reverie Under The Moonlight
Shared: Side Scroller · 2D Platformer · Metroidvania

Laika: Aged Through Blood
Shared: Platformer · Metroidvania · Arcade

VVVVVV
Shared: Precision Platformer · Platformer · 2D Platformer

INSIDE
Shared: 2.5D · Adventure · Platformer

SANABI
Shared: Adventure · 2D Platformer · Platformer

Funi Raccoon Game
Shared: Adventure · Platformer · 3D Platformer