Games like DUMMS!
Games like DUMMS! include Stardew Valley, Touhou Mystia's Izakaya, Graveyard Keeper, DAVE THE DIVER, and Cookie Clicker. We matched them by the tags players give DUMMS! on Steam (Casual, Simulation, RPG, Incremental, and Pixel Graphics): closest matches first, and among equally close ones the better-known games.

Stardew Valley
Shared: Pixel Graphics · RPG · Simulation

Touhou Mystia's Izakaya
Shared: Casual · Simulation · Pixel Graphics

Graveyard Keeper
Shared: RPG · Simulation · Pixel Graphics

DAVE THE DIVER
Shared: Casual · Pixel Graphics · RPG

Cookie Clicker
Shared: Casual · Incremental · Pixel Graphics

Dragon Cliff
Shared: RPG · Casual · Incremental

Click the Button
Shared: Casual · Incremental · Simulation

Papers, Please
Shared: Simulation · Indie · Pixel Graphics

Click Mage
Shared: Simulation · Casual · Incremental

Emily is Away Too
Shared: Simulation · Casual · Indie

Mountain
Shared: Simulation · Casual · Indie

Chinese Parents
Shared: Simulation · Casual · RPG

Knights of Pen and Paper 2
Shared: RPG · Simulation · Pixel Graphics

Sun Haven
Shared: Pixel Graphics · RPG · Simulation

Weapon Shop Fantasy
Shared: Simulation · RPG · Casual

My Time at Portia
Shared: RPG · Simulation · Casual

Unpacking
Shared: Casual · Pixel Graphics · Simulation

Melvor Idle
Shared: Casual · RPG · Indie

Idle Champions of the Forgotten Realms
Shared: Incremental · Fantasy · Casual

Vampire Survivors
Shared: Pixel Graphics · Casual · Indie

The Scroll of Taiwu : Beyond The Dome
Shared: RPG · Simulation · Indie

DELTARUNE
Shared: RPG · Pixel Graphics · Singleplayer

Knights of Pen and Paper +1 Edition
Shared: RPG · Casual · Pixel Graphics

No-brainer Heroes 挂机吧!勇者
Shared: Casual · RPG · Simulation