Games like Oblitus mortis
Games like Oblitus mortis include Hollow Knight, Hollow Knight: Silksong, Ori and the Will of the Wisps, SANABI, and Blasphemous 2. We matched them by the tags players give Oblitus mortis on Steam (Adventure, Metroidvania, Lore-Rich, Action-Adventure, and Mythology): closest matches first, and among equally close ones the better-known games.

Hollow Knight
Shared: Metroidvania · Platformer · Adventure

Hollow Knight: Silksong
Shared: Metroidvania · Adventure · Platformer

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

SANABI
Shared: Adventure · 2D Platformer · Pixel Graphics

Blasphemous 2
Shared: Metroidvania · Adventure · 2D Platformer

Dead Cells
Shared: Adventure · Metroidvania · 2D

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

Souldiers
Shared: Metroidvania · Action-Adventure · Adventure

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

Owlboy
Shared: Adventure · Metroidvania · Platformer

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

Haiku, the Robot
Shared: Adventure · Metroidvania · Platformer

Blasphemous
Shared: Metroidvania · 2D · Pixel Graphics

The Messenger
Shared: Metroidvania · Platformer · 2D

Celeste
Shared: Platformer · 2D Platformer · Adventure

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

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

Touhou Luna Nights
Shared: Metroidvania · Platformer · Action-Adventure

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

Constance
Shared: Metroidvania · Platformer · Action-Adventure

Afterimage
Shared: Metroidvania · 2D Platformer · Side Scroller

Tales of Kenzera™: ZAU
Shared: Adventure · Metroidvania · Action-Adventure

ANIMAL WELL
Shared: Metroidvania · Platformer · Adventure

Iconoclasts
Shared: Metroidvania · Adventure · Platformer