Games like Posthuman: Sanctuary
Games like Posthuman: Sanctuary include Last Oasis, DOKA 2 KISHKI EDITION, Delivery from the Pain:Survival / 末日方舟:生存, G2 Fighter / 基因特工, and Kenshi. We matched them by the tags players give Posthuman: Sanctuary on Steam (RPG, Indie, Early Access, Gore, and Violent): closest matches first, and among equally close ones the better-known games.

Last Oasis
Shared: RPG · Indie · Survival

DOKA 2 KISHKI EDITION
Shared: Gore · Indie · Violent

Delivery from the Pain:Survival / 末日方舟:生存
Shared: Indie · RPG · Survival

G2 Fighter / 基因特工
Shared: RPG · Indie · Early Access

Kenshi
Shared: RPG · Survival · Post-apocalyptic

Project Zomboid
Shared: Survival · Post-apocalyptic · Indie

V.L.A.D.i.K
Shared: Gore · RPG · Early Access

Fallout 76
Shared: RPG · Post-apocalyptic · Survival

Hotline Miami
Shared: Indie · Violent · Gore

Maneater
Shared: Violent · RPG · Gore

Obenseuer
Shared: Indie · RPG · Early Access

GORN
Shared: Gore · Indie · Violent

Hello Charlotte EP3: Childhood's End
Shared: Indie · Gore · RPG

Draconia
Shared: RPG · Indie · Early Access

The Black Masses
Shared: RPG · Indie · Gore

People Playground
Shared: Gore · Violent · Indie

Guardians of Orion (Phase 2)
Shared: Indie · RPG · Early Access

Dead State: Reanimated
Shared: RPG · Survival · Indie

ZomDay
Shared: Gore · Violent · Indie

Cepheus Protocol
Shared: Post-apocalyptic · Gore · Survival

NEO Scavenger
Shared: RPG · Post-apocalyptic · Survival

Hotline Miami 2: Wrong Number
Shared: Gore · Violent · Indie

Fallout 4 VR
Shared: RPG · Post-apocalyptic · Survival

Dead by Daylight
Shared: Gore · Violent · Survival