Solid game you've got thus far between theming, mechanics, visuals. Comes together quite well. I will say while playing it encountered two bugs that involved my shovel hat hitting a wall, staying in that wall, and me bouncing off to the other side of the level (the hat did disappear after landing). Then another where I had hit my characters head on the bottom of a platform and landed lower off then where my shovel hat had landed. Don't know if those were intentional but just making note if they weren't.
Beyond that, very solid game all around for a first game jam, do hope that they can be some more interesting mechanics added to it to come if you do end up expanding upon it but otherwise, great stuff. Keep up the good work