Games like Descenso
Games like Descenso include Hollow Knight, SANABI, Momodora: Reverie Under The Moonlight, Ori and the Will of the Wisps, and Hollow Knight: Silksong. We matched them by the tags players give Descenso on Steam (Adventure, Action-Adventure, Shooter, Platformer, and Side Scroller): closest matches first, and among equally close ones the better-known games.

Hollow Knight
Shared: Platformer · Metroidvania · Adventure

SANABI
Shared: Adventure · Action-Adventure · Pixel Graphics

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

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

Hollow Knight: Silksong
Shared: Metroidvania · Platformer · Adventure

Touhou Luna Nights
Shared: Side Scroller · Metroidvania · Platformer

Blasphemous 2
Shared: Adventure · Metroidvania · Side Scroller

Prince of Persia The Lost Crown
Shared: Adventure · Exploration · Metroidvania

Owlboy
Shared: Adventure · Platformer · Metroidvania

Escape From Duckov
Shared: Adventure · Shooter · Looter Shooter

Haiku, the Robot
Shared: Adventure · Metroidvania · Exploration

Afterimage
Shared: Metroidvania · Side Scroller · 2D Platformer

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

Rain World
Shared: Platformer · Exploration · Adventure

Dead Cells
Shared: Adventure · Metroidvania · Platformer

ANIMAL WELL
Shared: Exploration · Metroidvania · Platformer

Broforce
Shared: Platformer · Shooter · Pixel Graphics

MIO: Memories in Orbit
Shared: Platformer · Action-Adventure · Exploration

The Messenger
Shared: Platformer · Metroidvania · Pixel Graphics

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

The Darkest Tales — Into the Nightmare
Shared: Adventure · Action-Adventure · Platformer

Well Dweller
Shared: Action-Adventure · Adventure · Metroidvania

Axiom Verge
Shared: Platformer · Metroidvania · Adventure

Rabi-Ribi
Shared: Metroidvania · Action-Adventure · Exploration