Games like MoonCraft
Games like MoonCraft include No Man's Sky, Starbound, The Forest, Terraria, and The Long Dark. We matched them by the tags players give MoonCraft on Steam (Strategy, Exploration, Casual, Sandbox, and 3D): closest matches first, and among equally close ones the better-known games.

No Man's Sky
Shared: Exploration · Open World · Space

Starbound
Shared: Sandbox · Space · Survival

The Forest
Shared: Open World · Survival · Exploration

Terraria
Shared: Sandbox · Survival · Exploration

The Long Dark
Shared: Exploration · Open World · Survival

SPORE™
Shared: Sandbox · Exploration · Open World

Core Keeper
Shared: Exploration · Open World · Sandbox

Once Human
Shared: Open World · Exploration · Survival

ASTRONEER
Shared: Exploration · Open World · Space

Sons Of The Forest
Shared: Open World · Survival · Exploration

Don't Starve
Shared: Sandbox · Survival · Crafting

Rust
Shared: Open World · Survival · Sandbox

Conan Exiles Enhanced
Shared: Open World · Survival · Sandbox

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

TerraTech
Shared: Sandbox · Open World · Exploration

Slime Rancher
Shared: Exploration · Open World · Sandbox

Factorio
Shared: Strategy · Sandbox · Crafting

Subnautica
Shared: Exploration · Open World · Survival

SPORE™ Galactic Adventures
Shared: Exploration · Strategy · Sandbox

X4: Foundations
Shared: Exploration · Open World · Space

Green Hell
Shared: Open World · Survival · Exploration

Valheim
Shared: Open World · Exploration · Survival

Mount & Blade II: Bannerlord
Shared: Strategy · Open World · Sandbox

Stellaris
Shared: Strategy · Exploration · Space

