Games like Penguin
Games like Penguin include Downwell, Celeste, Tribal Hunter, Super Meat Boy, and Twin Shot Deluxe. We matched them by the tags players give Penguin on Steam (Birds, Action, Casual, Runner, and Platformer): closest matches first, and among equally close ones the better-known games.

Downwell
Shared: Precision Platformer · Platformer · Action

Celeste
Shared: Precision Platformer · Platformer · 2D Platformer

Tribal Hunter
Shared: Action · 2D Platformer · Casual

Super Meat Boy
Shared: Platformer · Precision Platformer · 2D Platformer

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

Brawlhalla
Shared: Casual · 2D Platformer · Platformer

Super Meat Boy Forever
Shared: Action · Platformer · Runner

Sonic Origins
Shared: Action · 2D Platformer · Platformer

pureya
Shared: Casual · Arcade · Action

Rogue Legacy 2
Shared: Action · Platformer · Arcade

ALTF4
Shared: Runner · Action · Casual

Sonic Superstars
Shared: Action · Platformer · Casual

SHINOBI: Art of Vengeance
Shared: Action · Platformer · 2D Platformer

Broforce
Shared: Action · Platformer · Side Scroller

Montaro
Shared: Casual · Runner · Platformer

SANABI
Shared: Action · 2D Platformer · Platformer

Katana ZERO
Shared: Action · Platformer · 2D Platformer

Gensokyo Night Festival
Shared: Action · Casual · Indie

Oozi: Earth Adventure
Shared: Platformer · 2D Platformer · Casual

Ninja Kiwi Archive
Shared: Casual · Action · Arcade

Webbed
Shared: 2D Platformer · Platformer · Action

Geometry Dash
Shared: Precision Platformer · Platformer · Action

BIT.TRIP Presents... Runner2: Future Legend of Rhythm Alien
Shared: Runner · Precision Platformer · Platformer

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