Games like Popup.exe
Games like Popup.exe include Cookie Clicker, Nodebuster, Shelldiver, Scritchy Scratchy, and Digseum. We matched them by the tags players give Popup.exe on Steam (Idler, Simulation, Casual, Experimental, and Management): closest matches first, and among equally close ones the better-known games.

Cookie Clicker
Shared: Idler · Casual · Incremental

Nodebuster
Shared: Casual · Idler · Simulation

Shelldiver
Shared: Casual · Idler · Management

Scritchy Scratchy
Shared: Idler · Incremental · Simulation

Digseum
Shared: Idler · Casual · Simulation

Fortune Mill
Shared: Idler · Simulation · Incremental

Game Dev Tycoon
Shared: Simulation · Management · Casual

Keep on Mining!
Shared: Idler · Casual · Incremental

Click and Conquer
Shared: Simulation · Casual · Idler

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

Click the Button
Shared: Casual · Idler · Simulation

Rusty's Retirement
Shared: Idler · Simulation · Management

DAVE THE DIVER
Shared: Casual · Management · Pixel Graphics

Incredicer
Shared: Idler · Casual · Incremental

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

Chef Knight
Shared: Simulation · Casual · Idler

Loot Loop
Shared: Simulation · Casual · Idler

Budgie's Bug Shop
Shared: Simulation · Casual · Idler

Tiny Pasture
Shared: Idler · Casual · Incremental

Bills Must Be Paid
Shared: Idler · Incremental · Casual

Supermarket Simulator
Shared: Simulation · Management · Economy

Gas Station Simulator
Shared: Simulation · Management · Economy

Lyca
Shared: Idler · Casual · Simulation

Cornerpond
Shared: Idler · Simulation · Incremental