Games like Remain
Games like Remain include Rust, DayZ, Project Zomboid, Once Human, and 7 Days to Die. We matched them by the tags players give Remain on Steam (Open World, Massively Multiplayer, Survival, Building, and Early Access): closest matches first, and among equally close ones the better-known games.

Rust
Shared: Survival · Open World · Building

DayZ
Shared: Open World · Survival · Massively Multiplayer

Project Zomboid
Shared: Open World · Survival · Post-apocalyptic

Once Human
Shared: Open World · Survival · Building

7 Days to Die
Shared: Survival · Open World · Post-apocalyptic

Last Oasis
Shared: Massively Multiplayer · Open World · Survival

Conan Exiles Enhanced
Shared: Open World · Survival · Building

Raft
Shared: Survival · Open World · Building

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

Valheim
Shared: Survival · Open World · Building

ARK: Survival Evolved
Shared: Survival · Open World · Building

PUBG: BATTLEGROUNDS
Shared: Survival · PvP · Massively Multiplayer

Miscreated
Shared: Open World · Survival · Massively Multiplayer

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

ARK: Survival Ascended
Shared: Open World · Survival · Building

The Isle
Shared: Open World · Survival · Massively Multiplayer

Enshrouded
Shared: Open World · Survival · Building

Terraria
Shared: Survival · Building · Open World

Kenshi
Shared: Open World · Survival · Post-apocalyptic

V Rising
Shared: Open World · Survival · Building

ATLAS
Shared: Open World · Survival · Massively Multiplayer

MISERY
Shared: Survival · Open World · Post-apocalyptic

RuneScape: Dragonwilds
Shared: Open World · Survival · Early Access

The Forest
Shared: Survival · Open World · Building