Games like Islet Online
Games like Islet Online include Rust, Last Oasis, Terraria, ARK: Survival Evolved, and Project Zomboid. We matched them by the tags players give Islet Online on Steam (Massively Multiplayer, Indie, Sandbox, RPG, and Multiplayer): closest matches first, and among equally close ones the better-known games.

Rust
Shared: Multiplayer · Survival · Sandbox

Last Oasis
Shared: Massively Multiplayer · RPG · Indie

Terraria
Shared: Sandbox · Multiplayer · Survival

ARK: Survival Evolved
Shared: Multiplayer · Survival · Building

Project Zomboid
Shared: Multiplayer · Sandbox · Survival

Palworld
Shared: Multiplayer · Indie · Survival

ARK: Survival Ascended
Shared: Multiplayer · Survival · Sandbox

Conan Exiles Enhanced
Shared: Survival · Building · Sandbox

Albion Online
Shared: Massively Multiplayer · Sandbox · RPG

Craftopia
Shared: Multiplayer · Sandbox · RPG

Don't Starve Together
Shared: Multiplayer · Survival · Sandbox

Scrap Mechanic
Shared: Sandbox · Building · Multiplayer

Raft
Shared: Multiplayer · Survival · Building

Valheim
Shared: Multiplayer · Survival · Building

7 Days to Die
Shared: Multiplayer · Survival · Open World

Stardew Valley
Shared: Multiplayer · RPG · Sandbox

Once Human
Shared: Multiplayer · Survival · Open World

Enshrouded
Shared: Multiplayer · RPG · Survival

Medieval Dynasty
Shared: Multiplayer · Building · Sandbox

Dark and Light
Shared: Massively Multiplayer · RPG · Sandbox

PixARK
Shared: Massively Multiplayer · Multiplayer · Sandbox

Necesse
Shared: Sandbox · Multiplayer · Indie

Trove
Shared: Sandbox · Multiplayer · RPG

ATLAS
Shared: Massively Multiplayer · Survival · Open World