Games like Catacombs 1: Demon War
Games like Catacombs 1: Demon War include Baldur's Gate 3, To the Moon, Pathfinder: Kingmaker - Enhanced Plus Edition, Clair Obscur: Expedition 33, and Solasta: Crown of the Magister. We matched them by the tags players give Catacombs 1: Demon War on Steam (Adventure, RPG, Indie, Dungeon Crawler, and Strategy RPG): closest matches first, and among equally close ones the better-known games.

Baldur's Gate 3
Shared: RPG · Adventure · CRPG

To the Moon
Shared: Indie · Adventure · Story Rich

Pathfinder: Kingmaker - Enhanced Plus Edition
Shared: RPG · CRPG · Strategy RPG

Clair Obscur: Expedition 33
Shared: RPG · Story Rich · Adventure

Solasta: Crown of the Magister
Shared: RPG · Adventure · Story Rich

OneShot
Shared: Indie · Story Rich · Adventure

The Witcher 3: Wild Hunt — Remastered
Shared: RPG · Adventure · Story Rich

Disco Elysium - The Final Cut
Shared: RPG · Story Rich · CRPG

OMORI
Shared: Indie · RPG · Story Rich

Hollow Knight: Silksong
Shared: Indie · Adventure · Difficult

Warhammer 40,000: Rogue Trader
Shared: RPG · CRPG · Adventure

A Bird Story
Shared: Indie · Adventure · Story Rich

Back to the Dawn
Shared: RPG · Adventure · Strategy RPG

Undertale
Shared: RPG · Story Rich · Indie

The Nameless: Slay Dragon
Shared: Adventure · RPG · CRPG

Firewatch
Shared: Adventure · Story Rich · Indie

Pillars of Eternity
Shared: RPG · Adventure · CRPG

DAVE THE DIVER
Shared: Adventure · Casual · RPG

Torment: Tides of Numenera
Shared: RPG · Adventure · Indie

Ruined King: A League of Legends Story™
Shared: RPG · Adventure · Indie

WILL: A Wonderful World / WILL:美好世界
Shared: RPG · Adventure · Indie

Hollow Knight
Shared: Indie · Adventure · Difficult

Esoteric Ebb
Shared: RPG · CRPG · Story Rich

Tainted Grail: The Fall of Avalon
Shared: RPG · Adventure · Exploration