This was a very simple little 2D platforming game. I enjoyed the sprite work and the music, but there wasn't a whole lot going on gameplay wise, unless I missed something? I think there was only jumping and swinging the sword. I couldn't interact with any items other than enemies that hurt me. The variety in the level structure was nice, lots of changes in direction, climbing, descending. The ending was very abrupt, I assume you were short on time putting this together. There didn't seem to be any references to the jam theme other than a variety of mushrooms.
edit: I couldn't figure out how to get this game into full screen, so in the future I think it would be important to integrate a full screen toggle or resize function, because most people won't have the patience to play in a tiny little window.