Games like Happy Summer Quest
Games like Happy Summer Quest include There Is No Game: Wrong Dimension, OneShot, Papers, Please, Baba Is You, and FEZ. We matched them by the tags players give Happy Summer Quest on Steam (Puzzle, 2D, Pixel Graphics, Hidden Object, and Singleplayer): closest matches first, and among equally close ones the better-known games.

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

OneShot
Shared: Pixel Graphics · Puzzle · Indie

Papers, Please
Shared: Pixel Graphics · Indie · Puzzle

Baba Is You
Shared: Puzzle · Indie · Singleplayer

FEZ
Shared: Puzzle · Pixel Graphics · Indie

The Rewinder
Shared: Puzzle · Pixel Graphics · Adventure

Gunpoint
Shared: Puzzle · 2D · Pixel Graphics

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

Out There Somewhere
Shared: Pixel Graphics · Puzzle · 2D

The Escapists
Shared: Pixel Graphics · 2D · Singleplayer

CrossCode
Shared: Pixel Graphics · Puzzle · 2D

LIMBO
Shared: Puzzle · Indie · 2D

DISTRAINT: Deluxe Edition
Shared: Pixel Graphics · 2D · Indie

The Room
Shared: Puzzle · Singleplayer · Hidden Object

Terraria
Shared: 2D · Pixel Graphics · Adventure

Pony Island
Shared: Puzzle · Pixel Graphics · Indie

Changed
Shared: Puzzle · Pixel Graphics · Singleplayer

CARRION
Shared: Pixel Graphics · 2D · Indie

Void Stranger
Shared: Puzzle · 2D · Singleplayer

Kindergarten 2
Shared: Pixel Graphics · Puzzle · Adventure

SANABI
Shared: Pixel Graphics · 2D · Singleplayer

To the Moon
Shared: Pixel Graphics · Indie · Singleplayer

Celeste
Shared: Pixel Graphics · Indie · 2D

Skul: The Hero Slayer
Shared: Pixel Graphics · Indie · 2D