Very cool! It was fun to play a little game that reminded me a bit of Zelda. It'd be nice to see a sequel of this game with several different bosses, more items, and some other characters. Perhaps even a plot!
On the other hand, if you ever make an extended version of this game then it'd be cool to get a stronger version of each item. A razor sharp sword that could fire projectiles every few seconds, an aegis shield that creates a magical barrier to protect all our sides (but recharges for a moment each time it blocks a hit for us), a sprint ring that lets us dash further, and a wraith amulet that protects us for twice as long.