Games like Oh My Hat
Games like Oh My Hat include Cookie Clicker, Melvor Idle, Dragon Cliff, Tiny Pasture, and Shelldiver. We matched them by the tags players give Oh My Hat on Steam (Casual, RPG, Idler, Incremental, and 2D): closest matches first, and among equally close ones the better-known games.

Cookie Clicker
Shared: Idler · Casual · Incremental

Melvor Idle
Shared: RPG · Casual · Idler

Dragon Cliff
Shared: RPG · Idler · Casual

Tiny Pasture
Shared: Idler · Casual · Incremental

Shelldiver
Shared: Casual · Incremental · Idler

Vampire Survivors
Shared: 2D · Casual · Pixel Graphics

Keep on Mining!
Shared: Casual · Idler · Incremental

To The Core
Shared: Casual · Incremental · 2D

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

Nodebuster
Shared: Casual · Incremental · Idler

Tower Wizard
Shared: Idler · Incremental · 2D

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

Click the Button
Shared: Casual · Idler · Incremental

Undertale
Shared: RPG · Pixel Graphics · 2D

Stardew Valley
Shared: RPG · Pixel Graphics · Casual

Crusaders Quest : Hero Town
Shared: RPG · Idler · Cute

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

Space Rock Breaker
Shared: Casual · Incremental · Idler

Impostor Factory
Shared: RPG · 2D · Pixel Graphics

Cauldron
Shared: Casual · Incremental · 2D

Marisa!ReturnTheBook!
Shared: Casual · Idler · Incremental

Swag and Sorcery
Shared: RPG · Incremental · Pixel Graphics

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

Digseum
Shared: Casual · Incremental · Idler