Games like Eldritchvania
Games like Eldritchvania include Hollow Knight, Hollow Knight: Silksong, Ori and the Will of the Wisps, ANIMAL WELL, and Nine Sols. We matched them by the tags players give Eldritchvania on Steam (Metroidvania, Difficult, Platformer, Exploration, and Puzzle Platformer): closest matches first, and among equally close ones the better-known games.

Hollow Knight
Shared: Metroidvania · Platformer · Difficult

Hollow Knight: Silksong
Shared: Metroidvania · Difficult · Platformer

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

ANIMAL WELL
Shared: Metroidvania · Exploration · Platformer

Nine Sols
Shared: Metroidvania · Difficult · Platformer

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

LIMBO
Shared: Puzzle Platformer · Platformer · Puzzle

La-Mulana
Shared: Metroidvania · Difficult · Platformer

Portal 2
Shared: Platformer · Singleplayer · Puzzle Platformer

Rain World
Shared: Difficult · Exploration · Platformer

Touhou Luna Nights
Shared: Metroidvania · Difficult · Exploration

MIO: Memories in Orbit
Shared: Metroidvania · Platformer · Exploration

Rogue Legacy 2
Shared: Metroidvania · Platformer · Difficult

Supraland
Shared: Metroidvania · Exploration · Puzzle Platformer

Celeste
Shared: Difficult · Platformer · Singleplayer

Teslagrad
Shared: Platformer · Metroidvania · Puzzle

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

FEZ
Shared: Platformer · Exploration · Puzzle

Blasphemous
Shared: Metroidvania · Difficult · 2D

Öoo
Shared: Metroidvania · Puzzle Platformer · Exploration

Cave Story+
Shared: Metroidvania · Difficult · Exploration

Valdis Story: Abyssal City
Shared: Metroidvania · Platformer · Difficult

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

Constance
Shared: Metroidvania · Platformer · 2D