Games like Geneforge 1 - Mutagen
Games like Geneforge 1 - Mutagen include Divinity: Original Sin - Enhanced Edition, Pathfinder: Kingmaker - Enhanced Plus Edition, Baldur's Gate 3, Divinity: Original Sin (Classic), and Pillars of Eternity II: Deadfire. We matched them by the tags players give Geneforge 1 - Mutagen on Steam (CRPG, RPG, Dungeon Crawler, Turn-Based, and Party-Based RPG): closest matches first, and among equally close ones the better-known games.

Divinity: Original Sin - Enhanced Edition
Shared: RPG · Turn-Based · Party-Based RPG

Pathfinder: Kingmaker - Enhanced Plus Edition
Shared: RPG · CRPG · Party-Based RPG

Baldur's Gate 3
Shared: RPG · CRPG · Story Rich

Divinity: Original Sin (Classic)
Shared: RPG · Turn-Based · CRPG

Pillars of Eternity II: Deadfire
Shared: RPG · CRPG · Party-Based RPG

Warhammer 40,000: Rogue Trader
Shared: RPG · CRPG · Turn-Based Strategy

Pillars of Eternity
Shared: RPG · CRPG · Party-Based RPG

Avernum: Escape From the Pit
Shared: RPG · Turn-Based · Party-Based RPG

Darkest Dungeon®
Shared: Dungeon Crawler · RPG · Turn-Based

Shadowrun Returns
Shared: RPG · Turn-Based · Strategy

Baldur's Gate: Enhanced Edition
Shared: CRPG · RPG · Party-Based RPG

Ruined King: A League of Legends Story™
Shared: RPG · Adventure · Party-Based RPG

Solasta: Crown of the Magister
Shared: RPG · Story Rich · Party-Based RPG

Wartales
Shared: RPG · Party-Based RPG · Turn-Based Strategy

Torment: Tides of Numenera
Shared: RPG · CRPG · Isometric

Shadowrun: Dragonfall - Director's Cut
Shared: RPG · Turn-Based · Strategy

Stoneshard
Shared: RPG · Turn-Based · Strategy

Wasteland 2: Director's Cut
Shared: RPG · Turn-Based · CRPG

Might & Magic X - Legacy
Shared: RPG · Turn-Based · Dungeon Crawler

The Dungeon Of Naheulbeuk: The Amulet Of Chaos
Shared: RPG · Turn-Based · Strategy

Shadowrun: Hong Kong - Extended Edition
Shared: RPG · Turn-Based · CRPG

The Banner Saga
Shared: Turn-Based · RPG · Turn-Based Strategy

Encased: A Sci-Fi Post-Apocalyptic RPG
Shared: CRPG · RPG · Strategy

Darkest Dungeon® II
Shared: Dungeon Crawler · Turn-Based · Party-Based RPG