Games like Fool's Guild
Games like Fool's Guild include Melvor Idle, Potion Craft: Alchemist Simulator, Cookie Clicker, Keep on Mining!, and Orb of Creation. We matched them by the tags players give Fool's Guild on Steam (Idler, Casual, Crafting, Singleplayer, and Resource Management): closest matches first, and among equally close ones the better-known games.

Melvor Idle
Shared: Idler · Casual · Singleplayer

Potion Craft: Alchemist Simulator
Shared: Crafting · Singleplayer · Indie

Cookie Clicker
Shared: Idler · Casual · Indie

Keep on Mining!
Shared: Idler · Casual · Singleplayer

Orb of Creation
Shared: Casual · Resource Management · Indie

Click the Button
Shared: Casual · Idler · Indie

Bloobs Adventure Idle
Shared: Casual · Idler · Indie

Factorio
Shared: Crafting · Resource Management · Casual

Shelldiver
Shared: Casual · Idler · Resource Management

Timber Rush
Shared: Idler · Casual · Indie

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

Mountain
Shared: Casual · Indie · Singleplayer

Idle Champions of the Forgotten Realms
Shared: Idler · Singleplayer · Casual

Keep on Mining! - Worlds
Shared: Casual · Idler · Indie

Drug Dealer Simulator
Shared: Singleplayer · Indie · Crafting

Forager
Shared: Crafting · Indie · Resource Management

It's Fine
Shared: Idler · Casual · Singleplayer

shapez
Shared: Crafting · Resource Management · Singleplayer

Master Of Pottery
Shared: Casual · Crafting · Indie

Incredicer
Shared: Idler · Casual · Indie

My Time at Portia
Shared: Crafting · Casual · Singleplayer

Fortune Mill
Shared: Idler · Casual · Resource Management

I Am Future: Cozy Apocalypse Survival
Shared: Casual · Singleplayer · Crafting

SPACEPLAN
Shared: Casual · Indie · Idler