Games like Walkabout
Games like Walkabout include The Forest, S.T.A.L.K.E.R. 2: Heart of Chornobyl - Standard Edition, The Long Dark, Fallout 4, and Metro Exodus. We matched them by the tags players give Walkabout on Steam (Realistic, Atmospheric, Open World, Survival, and First-Person): closest matches first, and among equally close ones the better-known games.

The Forest
Shared: Survival · Open World · First-Person

S.T.A.L.K.E.R. 2: Heart of Chornobyl - Standard Edition
Shared: Open World · Atmospheric · Survival

The Long Dark
Shared: Survival · Open World · Atmospheric

Fallout 4
Shared: Open World · Atmospheric · Singleplayer

Metro Exodus
Shared: Open World · Atmospheric · Singleplayer

Rust
Shared: Survival · Open World · First-Person

Stranded Deep
Shared: Survival · Open World · Realistic

Subnautica
Shared: Survival · Open World · Singleplayer

ARK: Survival Evolved
Shared: Survival · Open World · First-Person

Sons Of The Forest
Shared: Open World · Survival · First-Person

Far Cry® Primal
Shared: Open World · Survival · First-Person

Red Dead Redemption 2
Shared: Open World · Realistic · Singleplayer

Far Cry® 2
Shared: Open World · Realistic · First-Person

Valheim
Shared: Survival · Open World · Open World Survival Craft

Green Hell
Shared: Survival · Open World · Singleplayer

Raft
Shared: Survival · Open World · First-Person

No Man's Sky
Shared: Open World · Survival · First-Person

Fallout: New Vegas
Shared: Open World · Singleplayer · First-Person

Grand Theft Auto V Legacy
Shared: Open World · First-Person · Singleplayer

The Last Caretaker
Shared: Survival · Open World · First-Person

Once Human
Shared: Open World · Survival · Action

Don't Starve Together
Shared: Survival · Open World · Atmospheric

My Summer Car
Shared: Open World · Realistic · Survival

Road to Vostok
Shared: Realistic · Survival · Singleplayer