Great! Thanks for bringing it to my attention and helping improve the accuracy of this simulation. I've updated the official release with these changes.
Viewing post in Donkey Kong II - Diagonal Jumping
Hey your hitboxes for the play buttons on Ball and Flagman are broken, you might want to check the others too. I am using Chrome Browser. https://itizso.itch.io/retrofab
Clickable but very thin hitbox above the button.
These are very good btw well done.