Games like My Little Cosmos
Games like My Little Cosmos include Universe Sandbox, Kerbal Space Program, SpaceEngine, Cookie Clicker, and Mountain. We matched them by the tags players give My Little Cosmos on Steam (Desktop Companion, Idler, Simulation, Space, and Incremental): closest matches first, and among equally close ones the better-known games.

Universe Sandbox
Shared: Simulation · Space · Space Sim

Kerbal Space Program
Shared: Simulation · Space · Space Sim

SpaceEngine
Shared: Space · Casual · Space Sim

Cookie Clicker
Shared: Idler · Incremental · Casual

Mountain
Shared: Simulation · Casual · Space

Hardspace: Shipbreaker
Shared: Space · Simulation · Space Sim

SPORE™
Shared: Simulation · God Game · Space

Cornerpond
Shared: Desktop Companion · Idler · Simulation

Tiny Pasture
Shared: Idler · Incremental · Desktop Companion

Universe Sandbox
Shared: Simulation · Space · Casual

Space Engineers
Shared: Space · Simulation · Sandbox

Nodebuster
Shared: Idler · Incremental · Simulation

Shelldiver
Shared: Incremental · Idler · Casual

Kerbal Space Program 2
Shared: Space · Simulation · Sandbox

Elite Dangerous
Shared: Space · Space Sim · Simulation

Vanguard Galaxy
Shared: Idler · Space · Casual

Click the Button
Shared: Idler · Casual · Simulation

A Game About Feeding A Black Hole
Shared: Incremental · Idler · Casual

X4: Foundations
Shared: Simulation · Space · Space Sim

Digseum
Shared: Idler · Incremental · Simulation

Ropuka's Idle Island
Shared: Desktop Companion · Idler · Casual

How to Train Your Cock
Shared: Desktop Companion · Idler · Casual

How To Grow a Black Hole
Shared: Idler · Simulation · Casual

Solar 2
Shared: Space · Simulation · Casual