Games like Umille
Games like Umille include Hollow Knight, Clair Obscur: Expedition 33, Hollow Knight: Silksong, Dead Cells, and Lies of P. We matched them by the tags players give Umille on Steam (Adventure, Souls-like, Singleplayer, 2D, and Dark): closest matches first, and among equally close ones the better-known games.

Hollow Knight
Shared: Souls-like · 2D · Singleplayer

Clair Obscur: Expedition 33
Shared: Turn-Based Combat · Singleplayer · Adventure

Hollow Knight: Silksong
Shared: Souls-like · 2D · Singleplayer

Dead Cells
Shared: Adventure · 2D · Souls-like

Lies of P
Shared: Souls-like · Singleplayer · Adventure

STAR WARS Jedi: Survivor™
Shared: Singleplayer · Souls-like · Adventure

Like a Dragon: Infinite Wealth
Shared: Adventure · Turn-Based Combat · Singleplayer

Metaphor: ReFantazio
Shared: Adventure · Turn-Based Combat · Singleplayer

Persona 5 Royal
Shared: Singleplayer · JRPG · Turn-Based Combat

Yakuza: Like a Dragon
Shared: Adventure · Turn-Based Combat · JRPG

FINAL FANTASY VI
Shared: 2D · Adventure · Singleplayer

FINAL FANTASY X/X-2 HD Remaster
Shared: Turn-Based Combat · JRPG · Singleplayer

Little Nightmares II
Shared: Adventure · Singleplayer · Dark

REMNANT II®
Shared: Souls-like · Adventure · Dark

Mortal Shell II
Shared: Souls-like · Singleplayer · Dark

Persona 3 Reload
Shared: JRPG · Adventure · Turn-Based Combat

LIMBO
Shared: Adventure · Dark · 2D

Eastward
Shared: Adventure · Singleplayer · 2D

Blasphemous
Shared: Souls-like · 2D · Singleplayer

ENDER LILIES: Quietus of the Knights
Shared: Souls-like · Singleplayer · 2D

FINAL FANTASY
Shared: JRPG · 2D · Turn-Based Combat

FINAL FANTASY V
Shared: Singleplayer · Adventure · 2D

FINAL FANTASY III
Shared: Singleplayer · Adventure · 2D

Tails of Iron
Shared: Souls-like · Adventure · 2D