Games like The Psychoduck
Games like The Psychoduck include Gunpoint, Baba Is You, OneShot, Unpacking, and There Is No Game: Wrong Dimension. We matched them by the tags players give The Psychoduck on Steam (Puzzle, Pixel Graphics, Stealth, Indie, and Cute): closest matches first, and among equally close ones the better-known games.

Gunpoint
Shared: Puzzle · Stealth · Indie

Baba Is You
Shared: Puzzle · Indie · Pixel Graphics

OneShot
Shared: Pixel Graphics · Indie · Puzzle

Unpacking
Shared: Pixel Graphics · Cute · Puzzle

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

Untitled Goose Game
Shared: Puzzle · Villain Protagonist · Cute

I, Zombie
Shared: Puzzle · Stealth · Cute

Party Hard
Shared: Pixel Graphics · Stealth · Indie

Zup! S
Shared: Puzzle · Indie · Casual

Papers, Please
Shared: Indie · Pixel Graphics · Puzzle

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

Death Coming/死神来了
Shared: Pixel Graphics · Puzzle · Casual

FEZ
Shared: Puzzle · Pixel Graphics · Indie

CARRION
Shared: Pixel Graphics · Villain Protagonist · Indie

Dude, Stop
Shared: Puzzle · Pixel Graphics · Indie

Plants vs. Zombies GOTY Edition
Shared: Casual · Singleplayer · Puzzle

Donut County
Shared: Indie · Puzzle · Casual

Pony Island
Shared: Puzzle · Pixel Graphics · Indie

Changed
Shared: Puzzle · Cute · Pixel Graphics

World of Goo
Shared: Puzzle · Indie · Casual

Pikuniku
Shared: Puzzle · Indie · Cute

Hidden Folks
Shared: Puzzle · Indie · Casual

Cat Goes Fishing
Shared: Indie · Cute · 2D