Ooooo clean platformer y'all got! Game feels incredibly smooth and art and animations were integrated well. Will say, when I saw that the hammer was being used to help the character jump, I got excited and was hoping to see how that hammer was going to be used for gameplay. Kind of bummed to not see it used for any combat mechanic or even a forge mechanic. It was just such a cool detail I wish y'all developed more. If you guys do continue with this game, it would be cool to see how you can integrate that little thrown hammer into another gameplay element.
Regardless, good stuff and congrats on the first GWJ jam!