Games like Caldera
Games like Caldera include Stardew Valley, My Time at Portia, 鬼谷八荒 Tale of Immortal, Kenshi, and Terraria. We matched them by the tags players give Caldera on Steam (RPG, Simulation, Adventure, Action RPG, and Life Sim): closest matches first, and among equally close ones the better-known games.

Stardew Valley
Shared: RPG · Life Sim · Simulation

My Time at Portia
Shared: RPG · Life Sim · Simulation

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

Kenshi
Shared: RPG · Sandbox · Simulation

Terraria
Shared: Sandbox · Adventure · 2D

Don't Starve Together
Shared: Adventure · Sandbox · RPG

Disney Dreamlight Valley
Shared: Life Sim · Adventure · Simulation

Graveyard Keeper
Shared: RPG · Simulation · Sandbox

Potion Craft: Alchemist Simulator
Shared: Simulation · RPG · Crafting

The Scroll of Taiwu : Beyond The Dome
Shared: RPG · Sandbox · Adventure

Romestead
Shared: RPG · Adventure · 2D

The Sims™ 4
Shared: Life Sim · Simulation · Sandbox

Coral Island
Shared: Simulation · Life Sim · RPG

Littlewood
Shared: Simulation · Life Sim · RPG

The Sims™ 3
Shared: Simulation · Life Sim · Sandbox

Starsand Island
Shared: RPG · Life Sim · Simulation

inZOI
Shared: Simulation · Life Sim · Realistic

Kingdom Come: Deliverance
Shared: RPG · Adventure · Realistic

Rust
Shared: Adventure · Sandbox · Crafting

Project Zomboid
Shared: Sandbox · Simulation · RPG

Totally Accurate Battle Simulator
Shared: Simulation · Sandbox · Adventure

PC Building Simulator
Shared: Simulation · Immersive Sim · Sandbox

Mount & Blade II: Bannerlord
Shared: RPG · Sandbox · Simulation

Denizen
Shared: RPG · Life Sim · Adventure