Games like FlatFatCat
Games like FlatFatCat include World of Goo, Zup! S, Donut County, Plants vs. Zombies GOTY Edition, and Pikuniku. We matched them by the tags players give FlatFatCat on Steam (Casual, Indie, Action, Family Friendly, and Puzzle): closest matches first, and among equally close ones the better-known games.

World of Goo
Shared: Indie · Puzzle · Casual

Zup! S
Shared: Casual · Indie · Puzzle

Donut County
Shared: Casual · Indie · Puzzle

Plants vs. Zombies GOTY Edition
Shared: Casual · Singleplayer · 2D

Pikuniku
Shared: Indie · Casual · Puzzle

BEEP
Shared: Indie · 2D · Action

Peggle Deluxe
Shared: Casual · Puzzle · 2D

There Is No Game: Wrong Dimension
Shared: Indie · Puzzle · Casual

Gang Beasts
Shared: Action · Casual · Physics

Little Inferno
Shared: Casual · Indie · Puzzle

Octodad: Dadliest Catch
Shared: Indie · Family Friendly · Physics

Defy Gravity Extended
Shared: Indie · Puzzle · Action

A Dance of Fire and Ice
Shared: Indie · 2D · Difficult

Getting Over It with Bennett Foddy
Shared: Physics · Indie · Singleplayer

Haunt the House: Terrortown
Shared: Indie · Casual · Action

Cat Goes Fishing
Shared: Indie · Casual · 2D

Zup! 2
Shared: Casual · Indie · Puzzle

Hollow Knight: Silksong
Shared: Indie · 2D · Difficult

Zup!
Shared: Casual · Indie · Puzzle

Zuma's Revenge!
Shared: Casual · Action · Puzzle

Human Fall Flat
Shared: Puzzle · Physics · Action

Geometry Dash
Shared: 2D · Difficult · Indie

Zup! 8
Shared: Casual · Indie · Puzzle

Hollow Knight
Shared: Indie · 2D · Difficult