Games like ATMOSFAR
Games like ATMOSFAR include Valheim, Abiotic Factor, Raft, ARK: Survival Evolved, and Terraria. We matched them by the tags players give ATMOSFAR on Steam (Early Access, Sci-fi, Online Co-Op, Open World Survival Craft, and Survival): closest matches first, and among equally close ones the better-known games.

Valheim
Shared: Open World Survival Craft · Online Co-Op · Survival

Abiotic Factor
Shared: Online Co-Op · Survival · Open World Survival Craft

Raft
Shared: Survival · Open World Survival Craft · Crafting

ARK: Survival Evolved
Shared: Open World Survival Craft · Survival · Crafting

Terraria
Shared: Open World Survival Craft · Survival · Crafting

Windrose
Shared: Online Co-Op · Open World Survival Craft · Survival

Green Hell
Shared: Open World Survival Craft · Survival · Online Co-Op

Dune: Awakening
Shared: Open World Survival Craft · Survival · Base Building

ICARUS
Shared: Open World Survival Craft · Survival · Online Co-Op

Rust
Shared: Survival · Crafting · Open World Survival Craft

Palworld
Shared: Survival · Open World Survival Craft · Online Co-Op

The Planet Crafter
Shared: Open World Survival Craft · Online Co-Op · Survival

RuneScape: Dragonwilds
Shared: Survival · Open World Survival Craft · Online Co-Op

Nightingale
Shared: Open World Survival Craft · Survival · Online Co-Op

Subnautica
Shared: Open World Survival Craft · Survival · Crafting

Enshrouded
Shared: Survival · Online Co-Op · Crafting

The Forest
Shared: Open World Survival Craft · Survival · Crafting

Grounded
Shared: Survival · Open World Survival Craft · Crafting

7 Days to Die
Shared: Survival · Open World Survival Craft · Online Co-Op

Starbound
Shared: Open World Survival Craft · Survival · Online Co-Op

Don't Starve Together
Shared: Open World Survival Craft · Survival · Online Co-Op

ASTRONEER
Shared: Open World Survival Craft · Survival · Base Building

Subnautica: Below Zero
Shared: Open World Survival Craft · Survival · Singleplayer

No Man's Sky
Shared: Open World Survival Craft · Sci-fi · Survival