Wonderful job! The puzzles seemed fair and introduced a lot of mechanics with a simple core concept that I think did a great job honoring the theme of the jam!!
I think the art was cute, the character controller felt tight and responsive, and the puzzles were interesting!
I did find the controls a little bit too twitchy at times (specifically on the jump over lava with the molten lava shooting up level and the level with the coin, pillar, and dead bodies solution) but I think your addition of a casual mode solves for that!
Overall, wonderful submission to the jam and great work!!