Games like Princess Castle Quest
Games like Princess Castle Quest include Carto, Slime Rancher, A Monster's Expedition, A Hat in Time, and TOEM: A Photo Adventure. We matched them by the tags players give Princess Castle Quest on Steam (Puzzle, Exploration, Sokoban, Female Protagonist, and 2D): closest matches first, and among equally close ones the better-known games.

Carto
Shared: Puzzle · Exploration · Female Protagonist

Slime Rancher
Shared: Exploration · Funny · Cute

A Monster's Expedition
Shared: Puzzle · Sokoban · Exploration

A Hat in Time
Shared: Female Protagonist · Funny · Exploration

TOEM: A Photo Adventure
Shared: Puzzle · Exploration · Relaxing

Cat Goes Fishing
Shared: 2D · Exploration · Funny

Big Walk
Shared: Puzzle · Exploration · Funny

Webbed
Shared: Exploration · 2D · Cute

Is This Seat Taken?
Shared: Puzzle · Relaxing · Family Friendly

Turnip Boy Commits Tax Evasion
Shared: Puzzle · Exploration · Funny

Pikuniku
Shared: Puzzle · Funny · 2D

Hidden Through Time
Shared: Puzzle · 2D · Family Friendly

A Short Hike
Shared: Exploration · Relaxing · Cute

Hidden Folks
Shared: Puzzle · 2D · Funny

Donut County
Shared: Puzzle · Funny · Casual

Assemble with Care
Shared: Puzzle · Female Protagonist · Relaxing

Baba Is You
Shared: Puzzle · Sokoban · 2D

A Little to the Left
Shared: Puzzle · Relaxing · Family Friendly

Snufkin: Melody of Moominvalley
Shared: Puzzle · Funny · 2D

Scribblenauts Unlimited
Shared: Puzzle · Family Friendly · 2D

Lost in Play
Shared: Puzzle · 2D · Funny

GRIS
Shared: Female Protagonist · Puzzle · 2D

Monument Valley
Shared: Puzzle · Exploration · Female Protagonist

inbento
Shared: Puzzle · 2D · Funny