Games like Terrafort
Games like Terrafort include Core Keeper, Terraria, Factorio, RimWorld, and Once Human. We matched them by the tags players give Terrafort on Steam (Procedural Generation, Base Building, Open World, Sandbox, and Tower Defense): closest matches first, and among equally close ones the better-known games.

Core Keeper
Shared: Open World · Sandbox · Pixel Graphics

Terraria
Shared: Sandbox · Survival · Pixel Graphics

Factorio
Shared: Base Building · Sandbox · Open World

RimWorld
Shared: Base Building · Sandbox · Survival

Once Human
Shared: Open World · Action · Survival

7 Days to Die
Shared: Open World · Base Building · Survival

Satisfactory
Shared: Base Building · Open World · Sandbox

Scrap Mechanic
Shared: Sandbox · Open World · Base Building

ARK: Survival Evolved
Shared: Open World · Survival · Base Building

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

Oxygen Not Included
Shared: Base Building · Survival · Sandbox

No Man's Sky
Shared: Open World · Procedural Generation · Survival

Valheim
Shared: Open World · Base Building · Survival

The Riftbreaker
Shared: Base Building · Tower Defense · Survival

Kenshi
Shared: Open World · Sandbox · Survival

Enshrouded
Shared: Open World · Base Building · Survival

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

Space Engineers
Shared: Sandbox · Open World · Base Building

The Forest
Shared: Open World · Survival · Action

Raft
Shared: Open World · Survival · Base Building

Starbound
Shared: Sandbox · Survival · Pixel Graphics

Forager
Shared: Pixel Graphics · Sandbox · Survival

The Last Caretaker
Shared: Base Building · Open World · Survival

Grounded 2
Shared: Base Building · Open World · Survival