Hi!!! Thank you so much! And thanks for trying this game out.
Oh no! You should be able to "Grapple" onto that rock and jump off onto the other platform... Sorry that's not working for you! :( You can't walk on the upper platforms until you get to the end of the lower set and springboard yourself up there (after that hole/rock swing part, unfortunately). I added some GIFs to the page to show the gameplay. Well, if you ever feel up to trying again another time, maybe you'll be able to swing and jump that hole with just another try or two. :)
PS - I just showed my daughter your game and she LOVED it! And it was educational... bonus!!! LOL She loved the story of Earong/Orange as much as I did last year <3