Games like Forensh
Games like Forensh include Skul: The Hero Slayer, Hollow Knight, ICEY, Mark of the Ninja, and Zombotron. We matched them by the tags players give Forensh on Steam (Action, Platformer, Side Scroller, 2D, and Sci-fi): closest matches first, and among equally close ones the better-known games.

Skul: The Hero Slayer
Shared: Action · Indie · 2D

Hollow Knight
Shared: Platformer · 2D · Singleplayer

ICEY
Shared: Action · Side Scroller · Adventure

Mark of the Ninja
Shared: Platformer · Action · 2D

Zombotron
Shared: Action · 2D · Adventure

Dust: An Elysian Tail
Shared: Action · Platformer · 2D

Deadlight
Shared: Platformer · Action · Side Scroller

SANABI
Shared: Action · 2D · Singleplayer

Shovel Knight: Treasure Trove
Shared: Platformer · Action · 2D

Rogue Legacy
Shared: Platformer · Action · 2D

Broforce
Shared: Action · 2D · Platformer

MO:Astray
Shared: Action · Platformer · Indie

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

Axiom Verge
Shared: Platformer · Action · Indie

Gato Roboto
Shared: Action · Indie · 2D

Rogue Legacy 2
Shared: Platformer · Action · Indie

Monster Boy and the Cursed Kingdom
Shared: Action · Platformer · Adventure

LIMBO
Shared: Platformer · Indie · 2D

Ori and the Will of the Wisps
Shared: Platformer · Action · Singleplayer

Mark of the Ninja: Remastered
Shared: Action · 2D · Platformer

BEEP
Shared: Platformer · 2D · Action

Out There Somewhere
Shared: Platformer · 2D · Action

Nine Sols
Shared: Platformer · Action · 2D

Eastern Exorcist
Shared: Action · Side Scroller · 2D