Games like Isostasy
Games like Isostasy include Momodora: Reverie Under The Moonlight, Hollow Knight, Afterimage, The Messenger, and Haiku, the Robot. We matched them by the tags players give Isostasy on Steam (Metroidvania, Side Scroller, 2D Platformer, Platformer, and Action-Adventure): closest matches first, and among equally close ones the better-known games.

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

Hollow Knight
Shared: Metroidvania · Platformer · 2D

Afterimage
Shared: Metroidvania · 2D Platformer · Side Scroller

The Messenger
Shared: Metroidvania · Platformer · 2D

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

Ori and the Will of the Wisps
Shared: Metroidvania · Platformer · Action-Adventure

Well Dweller
Shared: Metroidvania · Action-Adventure · Cute

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

SANABI
Shared: 2D Platformer · 2D · Action-Adventure

Hollow Knight: Silksong
Shared: Metroidvania · 2D · Platformer

Touhou Luna Nights
Shared: Metroidvania · Side Scroller · Platformer

Celeste
Shared: Platformer · 2D Platformer · 2D

Rabi-Ribi
Shared: Metroidvania · Side Scroller · Cute

Skul: The Hero Slayer
Shared: 2D · Metroidvania · Platformer

Rain World
Shared: Platformer · 2D · 2D Platformer

Gato Roboto
Shared: Metroidvania · 2D · Platformer

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

Momodora: Moonlit Farewell
Shared: Metroidvania · Side Scroller · Action-Adventure

Monster Boy and the Cursed Kingdom
Shared: Metroidvania · Platformer · Side Scroller

Constance
Shared: Metroidvania · Platformer · 2D

Bō: Path of the Teal Lotus
Shared: Side Scroller · 2D Platformer · Metroidvania

Blasphemous
Shared: Metroidvania · 2D · Platformer

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

Axiom Verge 2
Shared: Metroidvania · Platformer · 2D Platformer

