The concept is really smart! I always wondered how the dungeon is always perfectly set up for the adventurer so this is such a great headcanon for Zelda games lol. It took some time, but once I finally figured out that backtracking through doors returned the key to me, finishing the puzzle was really fun, although it did have me wishing for more levels to put my newfound knowledge to use! I like the graphic style even though it's very similar to to A Link to the Past.