Games like Flewfie's Adventure
Games like Flewfie's Adventure include Portal 2, Rogue Legacy 2, LIMBO, Darwin's Paradox!, and Trine 5: A Clockwork Conspiracy. We matched them by the tags players give Flewfie's Adventure on Steam (Action, Cats, Action-Adventure, Arcade, and Platformer): closest matches first, and among equally close ones the better-known games.

Portal 2
Shared: Platformer · Puzzle · Puzzle Platformer

Rogue Legacy 2
Shared: Action · Arcade · Platformer

LIMBO
Shared: Platformer · Puzzle · Puzzle Platformer

Darwin's Paradox!
Shared: Action · Action-Adventure · Platformer

Trine 5: A Clockwork Conspiracy
Shared: Action · Action-Adventure · Platformer

Trine 2: Complete Story
Shared: Action-Adventure · Platformer · Puzzle Platformer

Pumpkin Jack
Shared: Action · Collectathon · Colorful

Defy Gravity Extended
Shared: Platformer · Action · Puzzle Platformer

Ori and the Will of the Wisps
Shared: Action · Platformer · Action-Adventure

Cuphead
Shared: Platformer · Cartoon · Action

STAR WARS Jedi: Fallen Order™
Shared: Action-Adventure · Action · Platformer

I wanna be the Creator
Shared: Action · Action-Adventure · Platformer

Trine 3: The Artifacts of Power
Shared: Action-Adventure · Puzzle Platformer · Puzzle

Planet of Lana
Shared: Action · Puzzle Platformer · Puzzle

BlazBlue Entropy Effect
Shared: Action · Action-Adventure · Platformer

Unravel
Shared: Action · Puzzle · Platformer

Broforce
Shared: Action · Platformer · 2D

FAR: Changing Tides
Shared: Action-Adventure · Platformer · Puzzle Platformer

Oddworld: New 'n' Tasty
Shared: Platformer · Action · Puzzle Platformer

Mark of the Ninja
Shared: Platformer · Action · Indie

Dust: An Elysian Tail
Shared: Action · Platformer · Indie

Freedom Planet 2
Shared: Platformer · Action-Adventure · Action

SANABI
Shared: Action · Action-Adventure · Platformer

Sonic Superstars
Shared: Action · Platformer · Action-Adventure