Games like Ritualist
Games like Ritualist include Hades, Curse of the Dead Gods, The Binding of Isaac: Rebirth, Hades II, and The Binding of Isaac. We matched them by the tags players give Ritualist on Steam (Action Roguelike, Dark Fantasy, Isometric, Difficult, and Roguelite): closest matches first, and among equally close ones the better-known games.

Hades
Shared: Action Roguelike · Roguelite · Indie

Curse of the Dead Gods
Shared: Action Roguelike · Dark Fantasy · Isometric

The Binding of Isaac: Rebirth
Shared: Action Roguelike · Difficult · Indie

Hades II
Shared: Action Roguelike · Roguelite · Action

The Binding of Isaac
Shared: Action Roguelike · Difficult · Indie

Skul: The Hero Slayer
Shared: Action Roguelike · Indie · Action

Vampire Survivors
Shared: Action Roguelike · Roguelite · Indie

Halls of Torment
Shared: Action Roguelike · Dark Fantasy · Roguelite

Noita
Shared: Difficult · Roguelike · Indie

Enter the Gungeon
Shared: Action Roguelike · Difficult · Roguelike

Darkest Dungeon®
Shared: Dark Fantasy · Difficult · Roguelike

Ravenswatch
Shared: Action Roguelike · Roguelike · Roguelite

Cinderia
Shared: Action Roguelike · Roguelite · Action

Risk of Rain 2
Shared: Action Roguelike · Roguelite · Roguelike

Megabonk
Shared: Action Roguelike · Roguelite · Indie

Dungreed
Shared: Action Roguelike · Roguelite · Roguelike

Risk of Rain (2013)
Shared: Action Roguelike · Indie · Roguelike

Nuclear Throne
Shared: Action Roguelike · Difficult · Indie

Garden of Witches
Shared: Action Roguelike · Roguelite · Difficult

SYNTHETIK: Legion Rising
Shared: Action Roguelike · Roguelite · Indie

Death Must Die
Shared: Action Roguelike · Roguelite · Action

Mortal Sin
Shared: Action Roguelike · Dark Fantasy · Indie

Windblown
Shared: Action Roguelike · Roguelite · Dark Fantasy

Dandy Ace
Shared: Isometric · Roguelite · Indie