It really shows how you good you worked together as a team, every aspect of your game feels polished and well done :) Your game was an instant feedback with my family :)
only two points could be enhanced:
I'm not sure if I can save at the save points a second time. On my way back from one of the items, I jumped into a pit, in the end, I did get the item, but I was not sure if I had do it again.
When you jump, sometimes the next platform is not visible, that makes it harder. Maybe you can adjust screensize or layout.