So I gave it another go.
One: really happy that there was progress saving!
Two: I think where I ran into issues is that I didn't unlock the last level of the first page, so I had no reason to assume I could go to page two. This one was really a hit and I hope to see it place highly!
I see! that's because the last level on each page is a bonus with certain conditions to be met to unlock (hinted by the lack of star requirements but only ???) also there is a blinking arrow on the right of the screen as soon as you have enough stars to have unlocked another level in the next page, I hoped this fixed the misunderstandings but it seems that's not the case :(