Games like Lux: The Journey
Games like Lux: The Journey include Terraria, The Forest, Rust, Starbound, and The Long Dark. We matched them by the tags players give Lux: The Journey on Steam (Adventure, Casual, Sandbox, Exploration, and Crafting): closest matches first, and among equally close ones the better-known games.

Terraria
Shared: Sandbox · Adventure · Survival

The Forest
Shared: Adventure · Crafting · Survival

Rust
Shared: Crafting · Survival · Adventure

Starbound
Shared: Sandbox · Adventure · Crafting

The Long Dark
Shared: Exploration · Adventure · Survival

Don't Starve
Shared: Adventure · Crafting · Sandbox

Portal Knights
Shared: Adventure · Sandbox · Crafting

Slime Rancher
Shared: Adventure · Exploration · Sandbox

Sons Of The Forest
Shared: Survival · Crafting · Adventure

Scrap Mechanic
Shared: Sandbox · Building · Survival

Valheim
Shared: Survival · Crafting · Exploration

Creativerse
Shared: Sandbox · Exploration · Adventure

Keplerth
Shared: Adventure · Sandbox · Exploration

No Man's Sky
Shared: Exploration · Adventure · Sandbox

ARK: Survival Evolved
Shared: Adventure · Survival · Crafting

Dune: Awakening
Shared: Exploration · Adventure · Sandbox

Core Keeper
Shared: Exploration · Sandbox · Survival

Stranded Deep
Shared: Adventure · Crafting · Survival

Subnautica
Shared: Exploration · Survival · Crafting

Raft
Shared: Survival · Crafting · Adventure

Satisfactory
Shared: Crafting · Sandbox · Exploration

Enshrouded
Shared: Adventure · Survival · Crafting

Don't Starve Together
Shared: Adventure · Survival · Crafting

Firewatch
Shared: Adventure · Walking Simulator · Exploration