Games like Slop Fest
Games like Slop Fest include Melvor Idle, Buckshot Roulette, Cookie Clicker, Moncage, and Berry Bury Berry. We matched them by the tags players give Slop Fest on Steam (Casual, Idler, 3D, Dark, and Surreal): closest matches first, and among equally close ones the better-known games.

Melvor Idle
Shared: Idler · Casual · Indie

Buckshot Roulette
Shared: Dark · 3D · Singleplayer

Cookie Clicker
Shared: Idler · Casual · Indie

Moncage
Shared: Casual · Indie · Surreal

Berry Bury Berry
Shared: 3D · Casual · Surreal

Keep on Mining!
Shared: Idler · Casual · Indie

Liars Bar
Shared: Casual · Indie · 3D

LIMBO
Shared: Indie · Dark · Singleplayer

Happy Game
Shared: Dark · Casual · Indie

WEBFISHING
Shared: Casual · Indie · 3D

Mini Motorways
Shared: Casual · Indie · Minimalist

TBH: Task Bar Hero
Shared: Idler · Casual · Indie

Nubby's Number Factory
Shared: Surreal · Singleplayer · Stylized

Mouthwashing
Shared: Indie · Dark · Surreal

Donut County
Shared: Casual · Indie · Singleplayer

To The Core
Shared: Casual · Indie · Singleplayer

Sizeable
Shared: Casual · Indie · 3D

Fishing The Abyss
Shared: Casual · Indie · Dark

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

Deskrawl: Idle ARPG
Shared: Idler · Casual · 3D

Little Inferno
Shared: Casual · Indie · Singleplayer

Bongo Cat
Shared: Idler · Casual · Singleplayer

Zup! S
Shared: Casual · Indie · Singleplayer

Mountain
Shared: Casual · Indie · Singleplayer