Games like Picnic Penguin
Games like Picnic Penguin include Baba Is You, There Is No Game: Wrong Dimension, Vampire Survivors, Timberman, and Peggle Deluxe. We matched them by the tags players give Picnic Penguin on Steam (Casual, Sokoban, Arcade, Puzzle, and 2D): closest matches first, and among equally close ones the better-known games.

Baba Is You
Shared: Puzzle · Sokoban · Indie

There Is No Game: Wrong Dimension
Shared: Puzzle · Casual · Pixel Graphics

Vampire Survivors
Shared: Pixel Graphics · 2D · Casual

Timberman
Shared: Casual · Pixel Graphics · 2D

Peggle Deluxe
Shared: Casual · Arcade · Puzzle

Patrick's Parabox
Shared: Sokoban · Puzzle · 2D

Zup! S
Shared: Casual · Puzzle · 2D

Shower With Your Dad Simulator 2015: Do You Still Shower With Your Dad
Shared: Arcade · Casual · 2D

Zuma Deluxe
Shared: Arcade · Puzzle · Casual

Progressbar95
Shared: Casual · Arcade · Puzzle

Please, Don’t Touch Anything
Shared: Puzzle · Pixel Graphics · Casual

Dude, Stop
Shared: Puzzle · Pixel Graphics · Casual

Cat Goes Fishing
Shared: 2D · Casual · Funny

Razortron 2000
Shared: Casual · Arcade · Indie

Cookie Clicker
Shared: Casual · Pixel Graphics · Indie

Is This Seat Taken?
Shared: Casual · Puzzle · Logic

Hexcells
Shared: Casual · Puzzle · Indie

Zup!
Shared: Casual · Puzzle · 2D

Little Inferno
Shared: Casual · Puzzle · Indie

FEZ
Shared: Puzzle · Pixel Graphics · Casual

Papers, Please
Shared: Pixel Graphics · Indie · Puzzle

SUPER CHICKEN JUMPER
Shared: Arcade · 2D · Pixel Graphics

RetroMaze
Shared: Casual · Puzzle · 2D

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