Games like Ephesus
Games like Ephesus include The Forest, Terraria, Rust, Don't Starve Together, and Once Human. We matched them by the tags players give Ephesus on Steam (Action, Crafting, Sandbox, Simulation, and Atmospheric): closest matches first, and among equally close ones the better-known games.

The Forest
Shared: Crafting · Action · Adventure

Terraria
Shared: Sandbox · Crafting · Adventure

Rust
Shared: Crafting · Sandbox · Action

Don't Starve Together
Shared: Co-op · Crafting · Sandbox

Once Human
Shared: Action · Co-op · Crafting

The Long Dark
Shared: Atmospheric · Crafting · Sandbox

Portal Knights
Shared: Sandbox · Crafting · Adventure

Core Keeper
Shared: Sandbox · Crafting · Co-op

Sons Of The Forest
Shared: Co-op · Crafting · Adventure

Stardew Valley
Shared: Simulation · Sandbox · Crafting

Monster Hunter: World
Shared: Action · Co-op · RPG

Medieval Dynasty
Shared: Crafting · Co-op · Sandbox

Black Desert
Shared: Sandbox · Crafting · Exploration

Grand Theft Auto V Legacy
Shared: Action · Adventure · Co-op

Warhammer 40,000: Space Marine 2
Shared: Action · Co-op · Adventure

Thief Simulator
Shared: Simulation · Co-op · Action

Out of Ore
Shared: Sandbox · Simulation · Exploration

Gothic 1 Remake
Shared: Action · Adventure · RPG

鬼谷八荒 Tale of Immortal
Shared: Simulation · Sandbox · Action

Fallout 4
Shared: Atmospheric · Adventure · RPG

PEAK
Shared: Co-op · Adventure · Exploration

Scrap Mechanic
Shared: Sandbox · Crafting · Co-op

Green Hell
Shared: Crafting · Action · Co-op

Graveyard Keeper
Shared: Crafting · Simulation · Sandbox