Games like The Whisperer
Games like The Whisperer include SANABI, Celeste, Afterimage, Anomaly Agent, and Portal 2. We matched them by the tags players give The Whisperer on Steam (2D Platformer, Action-Adventure, Side Scroller, Adventure, and Platformer): closest matches first, and among equally close ones the better-known games.

SANABI
Shared: 2D Platformer · Story Rich · Adventure

Celeste
Shared: 2D Platformer · Platformer · Female Protagonist

Afterimage
Shared: 2D Platformer · Side Scroller · Female Protagonist

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

Portal 2
Shared: Platformer · Story Rich · Action-Adventure

Tomb Raider Game of the Year
Shared: Adventure · Female Protagonist · Story Rich

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

Ori and the Will of the Wisps
Shared: Platformer · Adventure · Story Rich

ICEY
Shared: Side Scroller · Adventure · Female Protagonist

Songs for a Hero - Definitive Edition
Shared: 2D Platformer · Adventure · Platformer

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

Axiom Verge 2
Shared: Adventure · 2D Platformer · Action-Adventure

Katana ZERO
Shared: 2D Platformer · Platformer · Story Rich

Rise of the Tomb Raider™
Shared: Adventure · Action-Adventure · Female Protagonist

Mina the Hollower
Shared: Action-Adventure · 2D Platformer · Platformer

Iconoclasts
Shared: Adventure · Female Protagonist · Story Rich

F.I.S.T.: Forged In Shadow Torch
Shared: Platformer · 2D Platformer · Adventure

Owlboy
Shared: Adventure · Platformer · Story Rich

Touhou Hero of Ice Fairy
Shared: Side Scroller · Female Protagonist · Platformer

Hollow Knight
Shared: Platformer · Adventure · 2D

Gal Guardians: Demon Purge
Shared: 2D Platformer · Adventure · Side Scroller

Well Dweller
Shared: Action-Adventure · Adventure · 2D Platformer

Trine 5: A Clockwork Conspiracy
Shared: Adventure · Action-Adventure · 2D Platformer

Freedom Planet 2
Shared: Side Scroller · Platformer · Action-Adventure