Games like FailFactory
Games like FailFactory include Pizza Tower, INSIDE, Trine Enchanted Edition, Pumpkin Jack, and Exit the Gungeon. We matched them by the tags players give FailFactory on Steam (Action, Arcade, 2D Platformer, 2.5D, and Cartoony): closest matches first, and among equally close ones the better-known games.

Pizza Tower
Shared: 2D Platformer · Cartoony · Action

INSIDE
Shared: 2.5D · Atmospheric · Dark

Trine Enchanted Edition
Shared: 2D Platformer · Colorful · Fantasy

Pumpkin Jack
Shared: Action · Colorful · Adventure

Exit the Gungeon
Shared: Arcade · Action · 2D Platformer

A Dance of Fire and Ice
Shared: Arcade · Colorful · Action

Twin Shot Deluxe
Shared: Action · Arcade · 2D Platformer

Need for Speed™ Heat
Shared: Action · Arcade · Racing

Rogue Legacy 2
Shared: Arcade · Action · Indie

Planet of Lana
Shared: Action · 2D Platformer · Atmospheric

Sonic Origins
Shared: Action · 2D Platformer · Adventure

Seen
Shared: Dark · Action · Atmospheric

SANABI
Shared: Action · 2D Platformer · Adventure

Retrowave
Shared: Action · Racing · Arcade

DARK SOULS™: REMASTERED
Shared: Action · Dark · Atmospheric

Bing in Wonderland
Shared: 2D Platformer · Cartoony · Colorful

ALTF4
Shared: Action · Arcade · Colorful

UFO 50
Shared: Action · Arcade · Indie

Distance
Shared: Action · Racing · Arcade

BioShock Infinite
Shared: Action · Atmospheric · Fantasy

Alex Jones: NWO Wars
Shared: Action · Arcade · 2D Platformer

MARVEL Tōkon: Fighting Souls
Shared: Action · Arcade · 2.5D

Darwin's Paradox!
Shared: Action · Colorful · Arcade

Sonic Superstars
Shared: Action · 2D Platformer · Colorful