I generally like your idea

Suggestion:
- It is good that you can drag your notes around but to
minimize screen scratches, stylys wear and processor load ( ) and
to make your note handling faster perhaps
there should be a shortcut to automatically order/move your notes
as icons with preview to the left side "grid". Perhaps by double
tapping the green top left triangle program should move the note
to the next empty slot to the left side grid (and when there
are many notes program automatically decrease icon size/resize grid).
And similarly when you double tap the left side note icon
you instantly move the note to the topmost position to the right.
And hopefully program automatically saves the notes / loads
latest note set.