Games like Kselebox
Games like Kselebox include Stardew Valley, People Playground, WorldBox - God Simulator, Noita, and Sand:box. We matched them by the tags players give Kselebox on Steam (2D, Simulation, Sandbox, Indie, and Pixel Graphics): closest matches first, and among equally close ones the better-known games.

Stardew Valley
Shared: Pixel Graphics · Simulation · Sandbox

People Playground
Shared: Sandbox · 2D · Physics

WorldBox - God Simulator
Shared: Sandbox · Simulation · Pixel Graphics

Noita
Shared: Physics · Pixel Graphics · Sandbox

Sand:box
Shared: Simulation · Sandbox · 2D

Totally Accurate Battle Simulator
Shared: Simulation · Sandbox · Physics

Universe Sandbox
Shared: Simulation · Sandbox · Physics

Terraria
Shared: Sandbox · 2D · Pixel Graphics

Papers, Please
Shared: Simulation · Indie · Pixel Graphics

Garry's Mod
Shared: Sandbox · Physics · Simulation

Graveyard Keeper
Shared: Simulation · Pixel Graphics · Sandbox

Reus
Shared: Simulation · Indie · Sandbox

Potion Craft: Alchemist Simulator
Shared: Simulation · 2D · Indie

Goat Simulator
Shared: Simulation · Sandbox · Physics

Unpacking
Shared: Pixel Graphics · Simulation · Cute

Fields of Mistria
Shared: Pixel Graphics · Simulation · 2D

Kerbal Space Program
Shared: Simulation · Sandbox · Physics

The Sandbox
Shared: Simulation · Sandbox · Indie

Sticky Business
Shared: Simulation · Indie · Pixel Graphics

Game Dev Tycoon
Shared: Simulation · Indie · 2D

Simmiland
Shared: Simulation · Indie · Pixel Graphics

Equilinox
Shared: Simulation · Indie · Sandbox

Solar 2
Shared: Indie · Sandbox · Simulation

Townscaper
Shared: Sandbox · Simulation · Indie