Some nice core gameplay there, but to me personally it feels that sometimes less is more - I'd rather go find a rare fruit on a faraway tree and get a directed journey to get there and return back overcoming some obstacles, than doing a 100 chore side quests of picking abundant items around. Anyways, that is really subjective, and I can see audience for the game as it is.
Also was a bit confused on how to send my second potion back, as I didn't connect that each book is a separate quest and not a general delivery point - to me this picking flying item friction feels unnecessary.
Since the very beginning and first look around started to wonder if I'd ever get to other islands, nice work!