You did a great job! The art is cohesive, the music is good, and it had all the elements of a full game. I liked the riddle in addition to the combat. I also liked how you managed to fit in a little exploration, too.
The one critique I have is I had a hard time figuring out where the hit boxes were. I only realized I was taking damage when I lost hearts. The combat wasn't super difficult, so it is really a minor critique.
I hope you feel proud, because this is a well done game jam submission. Really nice job. I'm looking forward to seeing more games from you.