Games like Nightmare on Azathoth
Games like Nightmare on Azathoth include Don't Starve Together, The Forest, Rain World, Don't Starve, and Sons Of The Forest. We matched them by the tags players give Nightmare on Azathoth on Steam (Adventure, Action, Indie, Survival, and Survival Horror): closest matches first, and among equally close ones the better-known games.

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

The Forest
Shared: Survival · Adventure · Action

Rain World
Shared: Survival · Indie · Difficult

Don't Starve
Shared: Adventure · Survival · Indie

Sons Of The Forest
Shared: Survival · Survival Horror · Adventure

Feed and Grow: Fish
Shared: Survival · Action · Simulation

Green Hell
Shared: Survival · Action · Adventure

We Happy Few
Shared: Adventure · Action · Survival

Hand Simulator: Survival
Shared: Adventure · Survival · Action

Bendy and the Dark Revival
Shared: Action · Adventure · Survival Horror

Outlast
Shared: Survival Horror · Survival · Adventure

Barotrauma
Shared: Survival · Survival Horror · Simulation

The Beast Inside
Shared: Adventure · Action · Survival Horror

PUBG: BATTLEGROUNDS
Shared: Survival · Action · Adventure

The Long Dark
Shared: Survival · Adventure · Indie

Bum Simulator
Shared: Adventure · Action · Survival

The Escapists
Shared: Indie · Action · Adventure

Daymare: 1998
Shared: Action · Adventure · Survival Horror

Resident Evil 4 (2005)
Shared: Action · Survival Horror · Adventure

Terraria
Shared: Survival · Adventure · Indie

Pacific Drive
Shared: Survival · Survival Horror · Adventure

Darkwood
Shared: Adventure · Action · Survival Horror

Rust
Shared: Survival · Adventure · Action

Ultimate Custom Night
Shared: Survival Horror · Difficult · Survival