So you are not the only one that didn't get this immediately. I had someone submit a playthrough of the game (It's submitted in the itch.io page) and while looking at it, I kept wishing I could reach out and say that you have to hit people from far away to get a bounce 😄
This is the reason why I included a playthrough of the game myself.
But I'm super happy you figured it out! Thank you so much for playing