Games like Red's Ascent
Games like Red's Ascent include Dead Cells, Skul: The Hero Slayer, Anomaly Agent, Momodora: Reverie Under The Moonlight, and Afterimage. We matched them by the tags players give Red's Ascent on Steam (Action Roguelike, Exploration, Metroidvania, Side Scroller, and 2D Platformer): closest matches first, and among equally close ones the better-known games.

Dead Cells
Shared: Action Roguelike · Metroidvania · Roguelike

Skul: The Hero Slayer
Shared: Action Roguelike · Metroidvania · Roguelike

Anomaly Agent
Shared: Action Roguelike · Side Scroller · 2D Platformer

Momodora: Reverie Under The Moonlight
Shared: Metroidvania · Side Scroller · Exploration

Afterimage
Shared: Metroidvania · 2D Platformer · Exploration

Prince of Persia The Lost Crown
Shared: Exploration · Metroidvania · 2D Platformer

Rogue Legacy
Shared: Action Roguelike · Platformer · Metroidvania

Touhou Luna Nights
Shared: Metroidvania · Side Scroller · Exploration

Hollow Knight
Shared: Metroidvania · Platformer · Exploration

Hollow Knight: Silksong
Shared: Metroidvania · Exploration · Platformer

Frontier Hunter: Erza’s Wheel of Fortune
Shared: Metroidvania · Side Scroller · 2D Platformer

Rabi-Ribi
Shared: Metroidvania · Exploration · Side Scroller

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

BlazBlue Entropy Effect
Shared: Action Roguelike · Platformer · Action-Adventure

Castlevania: Belmont's Curse
Shared: Metroidvania · 2D Platformer · Platformer

30XX
Shared: Action Roguelike · Side Scroller · 2D Platformer

Divinum
Shared: Metroidvania · Hack and Slash · 2D Platformer

9 Years of Shadows
Shared: Metroidvania · Side Scroller · Platformer

Ori and the Will of the Wisps
Shared: Metroidvania · Platformer · Exploration

Dust: An Elysian Tail
Shared: Metroidvania · Platformer · Action

Timespinner
Shared: Metroidvania · Side Scroller · Exploration

Blasphemous 2
Shared: Metroidvania · 2D Platformer · Side Scroller

ICEY
Shared: Side Scroller · Hack and Slash · Female Protagonist

Haiku, the Robot
Shared: Metroidvania · Exploration · 2D Platformer

