Castle Helios
From Playdate Community Wiki
Description from itch.io page:
Castle Helios is an exploration and puzzle adventure game with a bit of combat. Set as a prequel to The Wizard's Apprentice, you play as Emperor Solus before he became Emperor. Recently having lost his powers while fighting the current ruler of Castle Helios, the evil King Etanakh, Solus must find the 6 Magic Keys that will allow him to escape the Castle alive.
Use magic spells to help you traverse the Castle's rooms, kill or evade monsters, defeat bosses, and solve puzzles. But first, you must find the magic items that grant you these abilities.
