Games like Universe Horizon
Games like Universe Horizon include Cookie Clicker, Tower Wizard, Fortune Mill, Shelldiver, and Dyson Sphere Program. We matched them by the tags players give Universe Horizon on Steam (Idler, Incremental, Exploration, Space, and Automation): closest matches first, and among equally close ones the better-known games.

Cookie Clicker
Shared: Idler · Incremental · Indie

Tower Wizard
Shared: Idler · Incremental · Resource Management

Fortune Mill
Shared: Idler · Incremental · Automation

Shelldiver
Shared: Incremental · Idler · Resource Management

Dyson Sphere Program
Shared: Space · Automation · Resource Management

Click the Button
Shared: Incremental · Idler · Indie

Horripilant
Shared: Idler · Incremental · Resource Management

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

Incredicer
Shared: Idler · Incremental · Indie

Idle Champions of the Forgotten Realms
Shared: Idler · Incremental · Strategy

Diggin
Shared: Incremental · Exploration · Idler

Nodebuster
Shared: Incremental · Idler · Strategy

All Hail the Orb
Shared: Incremental · Exploration · Idler

Dragon Cliff
Shared: Idler · Incremental · Strategy

Digseum
Shared: Incremental · Idler · Simulation

Cosmoteer: Starship Architect & Commander
Shared: Space · 2D · Exploration

Oxygen Not Included
Shared: Resource Management · 2D · Space

Keep on Mining!
Shared: Idler · Incremental · Indie

Fracture Field
Shared: Idler · Incremental · Automation

Melvor Idle
Shared: Idler · Indie · 2D

Starvester
Shared: Idler · Incremental · Automation

Stellaris
Shared: Space · Exploration · Strategy

(the) Gnorp Apologue
Shared: Idler · Incremental · Strategy

Bloobs Adventure Idle
Shared: Idler · Incremental · Automation