Games like Cursed Core
Games like Cursed Core include Terraria, Don't Starve Together, Starbound, Rust, and Core Keeper. We matched them by the tags players give Cursed Core on Steam (Simulation, RPG, Sandbox, Survival, and Crafting): closest matches first, and among equally close ones the better-known games.

Terraria
Shared: Sandbox · Survival · Adventure

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

Starbound
Shared: Sandbox · Survival · Crafting

Rust
Shared: Survival · Crafting · Sandbox

Core Keeper
Shared: Survival · Sandbox · Crafting

The Forest
Shared: Survival · Crafting · Adventure

Kenshi
Shared: Sandbox · RPG · Survival

Stardew Valley
Shared: RPG · Simulation · Sandbox

Graveyard Keeper
Shared: RPG · Simulation · Crafting

Portal Knights
Shared: Sandbox · RPG · Adventure

The Long Dark
Shared: Survival · Simulation · Sandbox

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

Conan Exiles Enhanced
Shared: Survival · Crafting · Sandbox

Forager
Shared: Survival · Crafting · Sandbox

Don't Starve
Shared: Survival · Crafting · Sandbox

My Time at Portia
Shared: RPG · Simulation · Crafting

Once Human
Shared: Survival · Action · Crafting

DAVE THE DIVER
Shared: Adventure · Casual · RPG

Necesse
Shared: Sandbox · Survival · Crafting

The Escapists
Shared: Simulation · Crafting · Survival

Project Zomboid
Shared: Survival · Sandbox · Crafting

Keplerth
Shared: Sandbox · Survival · Adventure

Enshrouded
Shared: Survival · RPG · Crafting

Last Oasis
Shared: RPG · Survival · Adventure