Games like Mutagen Extinction
Games like Mutagen Extinction include Last Oasis, Middle-earth: Shadow of War, Remnant: From the Ashes, God of War, and Rust. We matched them by the tags players give Mutagen Extinction on Steam (Action, Adventure, RPG, Indie, and Violent): closest matches first, and among equally close ones the better-known games.

Last Oasis
Shared: Action · RPG · Adventure

Middle-earth: Shadow of War
Shared: Action · RPG · Adventure

Remnant: From the Ashes
Shared: Action · RPG · Adventure

God of War
Shared: Action · Adventure · RPG

Rust
Shared: Survival · Adventure · Action

DOKA 2 KISHKI EDITION
Shared: Action · Violent · Indie

Warhammer 40,000: Inquisitor - Prophecy
Shared: Action · Adventure · RPG

Yakuza: Like a Dragon
Shared: Adventure · Action · RPG

Terraria
Shared: Survival · Adventure · Indie

Yakuza Kiwami
Shared: Action · Adventure · RPG

Warhammer 40,000: Inquisitor - Martyr
Shared: Action · RPG · Adventure

G2 Fighter / 基因特工
Shared: Adventure · Action · RPG

BEARS, VODKA, BALALAIKA! 🐻
Shared: Action · Indie · Violent

Hand Simulator: Survival
Shared: Adventure · Survival · Action

Dust: An Elysian Tail
Shared: Action · Indie · RPG

Don't Starve Together
Shared: Survival · Adventure · Indie

Bladed fury
Shared: Action · Adventure · Indie

Yakuza Kiwami 2
Shared: Action · RPG · Adventure

The Black Masses
Shared: Action · Adventure · RPG

The Ascent
Shared: RPG · Action · Adventure

Escape From Duckov
Shared: Action · Adventure · Survival

Black Myth: Wukong
Shared: Action · RPG · Adventure

The Walking Dead: Saints & Sinners
Shared: Action · Adventure · Survival

The Wind Road
Shared: Action · RPG · Adventure