Games like Kunlun Wonderland
Games like Kunlun Wonderland include Garry's Mod, Stardew Valley, SpaceEngine, The Scroll of Taiwu : Beyond The Dome, and PowerWash Simulator. We matched them by the tags players give Kunlun Wonderland on Steam (Casual, RPG, Simulation, MOBA, and MMORPG): closest matches first, and among equally close ones the better-known games.

Garry's Mod
Shared: Casual · Sandbox · Simulation

Stardew Valley
Shared: RPG · Simulation · Sandbox

SpaceEngine
Shared: Casual · Space Sim · Sandbox

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

PowerWash Simulator
Shared: Casual · Simulation · Sandbox

Prison Simulator
Shared: Casual · RPG · Simulation

My Time at Portia
Shared: RPG · Casual · Simulation

Aimlabs
Shared: Simulation · Shooter · FPS

s&box
Shared: Casual · Sandbox · Shooter

Touhou Mystia's Izakaya
Shared: Casual · Simulation · RPG

BidKing
Shared: Casual · Simulation · MOBA

SPORE™
Shared: Simulation · Casual · Sandbox

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

Freeman: Guerrilla Warfare
Shared: RPG · Shooter · Sandbox

Kerbal Space Program
Shared: Simulation · Sandbox · Space Sim

Starsand Island
Shared: RPG · Casual · Simulation

Arma Reforger
Shared: Simulation · Shooter · FPS

The Sims™ 3
Shared: Simulation · Casual · Sandbox

Goat Simulator
Shared: Simulation · Casual · Sandbox

Universe Sandbox
Shared: Simulation · Space Sim · Sandbox

Trove
Shared: MMORPG · Sandbox · RPG

SMITE®
Shared: MOBA · MMORPG · Simulation

Arma 3
Shared: Simulation · Shooter · Sandbox

Rising Front
Shared: Simulation · Sandbox · Shooter