Games like Scrapnaut
Games like Scrapnaut include Terraria, Valheim, Raft, Rust, and Palworld. We matched them by the tags players give Scrapnaut on Steam (Building, Survival, Multiplayer, Online Co-Op, and Adventure): closest matches first, and among equally close ones the better-known games.

Terraria
Shared: Survival · Multiplayer · Sandbox

Valheim
Shared: Survival · Building · Multiplayer

Raft
Shared: Survival · Multiplayer · Co-op

Rust
Shared: Survival · Multiplayer · Building

Palworld
Shared: Survival · Multiplayer · Online Co-Op

Don't Starve Together
Shared: Survival · Multiplayer · Co-op

ARK: Survival Evolved
Shared: Survival · Multiplayer · Building

7 Days to Die
Shared: Survival · Multiplayer · Building

Sons Of The Forest
Shared: Survival · Multiplayer · Co-op

ASTRONEER
Shared: Multiplayer · Survival · Open World Survival Craft

Once Human
Shared: Multiplayer · Survival · Building

Green Hell
Shared: Survival · Multiplayer · Online Co-Op

Grounded
Shared: Survival · Multiplayer · Co-op

Project Zomboid
Shared: Survival · Multiplayer · Co-op

Enshrouded
Shared: Survival · Multiplayer · Online Co-Op

Satisfactory
Shared: Multiplayer · Building · Co-op

Core Keeper
Shared: Survival · Multiplayer · Building

ICARUS
Shared: Survival · Multiplayer · Online Co-Op

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

Scrap Mechanic
Shared: Building · Survival · Multiplayer

RuneScape: Dragonwilds
Shared: Survival · Multiplayer · Co-op

Starbound
Shared: Survival · Sandbox · Adventure

The Planet Crafter
Shared: Survival · Building · Co-op

Conan Exiles Enhanced
Shared: Survival · Building · Multiplayer