Games like Ficterra
Games like Ficterra include Terraria, Rust, No Man's Sky, Raft, and Valheim. We matched them by the tags players give Ficterra on Steam (Open World Survival Craft, Sandbox, Exploration, Voxel, and Building): closest matches first, and among equally close ones the better-known games.

Terraria
Shared: Open World Survival Craft · Sandbox · Exploration

Rust
Shared: Open World Survival Craft · Sandbox · Building

No Man's Sky
Shared: Open World Survival Craft · Exploration · Sandbox

Raft
Shared: Open World Survival Craft · Building · Multiplayer

Valheim
Shared: Open World Survival Craft · Building · Exploration

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

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

Garry's Mod
Shared: Sandbox · Building · Moddable

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

Stranded Deep
Shared: Open World Survival Craft · Exploration · First-Person

Starbound
Shared: Open World Survival Craft · Sandbox · Exploration

Satisfactory
Shared: Sandbox · Building · Crafting

Don't Starve Together
Shared: Open World Survival Craft · Sandbox · Multiplayer

Creativerse
Shared: Sandbox · Exploration · Voxel

Don't Starve
Shared: Open World Survival Craft · Sandbox · Crafting

ASTRONEER
Shared: Open World Survival Craft · Exploration · Sandbox

TerraTech
Shared: Sandbox · Open World Survival Craft · Building

Once Human
Shared: Open World Survival Craft · Exploration · Building

PEAK
Shared: Exploration · Multiplayer · First-Person

The Long Dark
Shared: Open World Survival Craft · Exploration · First-Person

Dune: Awakening
Shared: Open World Survival Craft · Exploration · Sandbox

Palworld
Shared: Open World Survival Craft · Multiplayer · Sandbox

Project Zomboid
Shared: Open World Survival Craft · Sandbox · Multiplayer

ICARUS
Shared: Open World Survival Craft · Exploration · Multiplayer