Games like Frontier Planetfall
Games like Frontier Planetfall include No Man's Sky, The Forest, Sons Of The Forest, Terraria, and Core Keeper. We matched them by the tags players give Frontier Planetfall on Steam (Exploration, Sandbox, Action, Action-Adventure, and 3D): closest matches first, and among equally close ones the better-known games.

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

The Forest
Shared: Adventure · Open World · Exploration

Sons Of The Forest
Shared: Open World · Exploration · Base Building

Terraria
Shared: Sandbox · Exploration · Adventure

Core Keeper
Shared: Exploration · Sandbox · Open World

Once Human
Shared: Action · Exploration · Open World

Rust
Shared: Sandbox · Open World · Adventure

Satisfactory
Shared: Base Building · Sandbox · Exploration

ARK: Survival Evolved
Shared: Open World · Adventure · Action

Black Desert
Shared: Sandbox · Exploration · Action-Adventure

Scrap Mechanic
Shared: Sandbox · Open World · Building

Fallout 4
Shared: Exploration · Open World · Adventure

Far Cry® 5
Shared: Action-Adventure · Exploration · Open World

Slime Rancher
Shared: Exploration · Adventure · Sandbox

Crimson Desert Enhanced
Shared: Exploration · Action · Open World

Far Cry® 6
Shared: Action-Adventure · Action · Exploration

Valheim
Shared: Exploration · Open World · Base Building

Grounded 2
Shared: Action · Exploration · Adventure

ARK: Survival Ascended
Shared: Sandbox · Open World · Base Building

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

PEAK
Shared: Exploration · Adventure · First-Person

Grand Theft Auto V Legacy
Shared: Action · Open World · First-Person

The Last Caretaker
Shared: Sandbox · Base Building · Exploration

Enshrouded
Shared: Exploration · Open World · Base Building