As it turns out, I had a bug that just doesn't let you collect them and I was unable to fix the bug in time ;-; I plan on polishing it and uploading it separately from the Game Jam but I'm glad you enjoyed! As for tips, I tend to make sure my horizontal movement is at the highest level I can.
Oh oops I'm extra wrong haha, the hit box to collect the heart dice is the heart instead of the die; they are obtainable by reaching the die at the peak of your jump.
