Games like test_project
Games like test_project include Hook, Strange Jigsaws, Zup! S, A Little to the Left, and klocki. We matched them by the tags players give test_project on Steam (Casual, 2D, Abstract, Puzzle, and Singleplayer): closest matches first, and among equally close ones the better-known games.

Hook
Shared: Casual · Puzzle · Abstract

Strange Jigsaws
Shared: Casual · 2D · Puzzle

Zup! S
Shared: Casual · Puzzle · 2D

A Little to the Left
Shared: Puzzle · Casual · Relaxing

klocki
Shared: Casual · Puzzle · Relaxing

Zup!
Shared: Casual · Puzzle · 2D

Hexcells
Shared: Casual · Puzzle · Singleplayer

Zup! 2
Shared: Casual · Puzzle · 2D

Zup! F
Shared: Casual · Puzzle · 2D

A Game About Feeding A Black Hole
Shared: Casual · 2D · Relaxing

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

Zup! X
Shared: Casual · Puzzle · 2D

Nodebuster
Shared: Casual · 2D · Abstract

Mini Metro
Shared: Puzzle · Casual · Singleplayer

Zup! 3
Shared: Casual · Puzzle · 2D

Cat Goes Fishing
Shared: 2D · Casual · Singleplayer

Hidden Folks
Shared: Casual · Puzzle · 2D

LYNE
Shared: Puzzle · Casual · Abstract

Zup! 8
Shared: Casual · Puzzle · 2D

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

Glass Masquerade
Shared: Casual · Puzzle · Relaxing

Unpacking
Shared: Casual · Relaxing · Puzzle

aMAZE
Shared: 2D · Puzzle · Casual

Samorost 1
Shared: Casual · Puzzle · 2D