This had some GREAT juice and game feel! A super good execution of the "count down is your health" approach and movement was very very fantastic and polished - you've got all the quality of life things a platformer needs. I adore the inclusion of being able to see past runs, it reminds me of when I played and was obsessed with speedrunning Super Meat Boy. You've also managed to include bosses during the span of the jam, excellent work!
Aside from some balancing notes mentioned in previous comments like just being able to grind the first area, I felt the control choice was just a little weird of having J be attack and E be interact since they're so far apart - it might be better to have movement grouped in one place and all other buttons in another (for example, arrow keys for movement, Z for jump, X to attack, etc.) But this also comes down to personal preference, maybe I'm just weird!
Really fun entry, great work!!