So, here is a completed map where you can find all the different routes with all the different choices you can make.
Map (with the option to save and/or export for those who want to edit):
https://link.excalidraw.com/l/84AW7yZQM7h/7HuAkd7c5K7
As an image: https://i.imgur.com/nr0fm8N.jpg
The map contains all the different princess-vessels you can collect, all (or mostly all) choices you can make, all world branches and their intersections, and all possible endings and how to get them.
It's just a guide to help you; there may not be a full description of the dialogue options you have to choose, but you will understand it by following the map. If the map doesn't describe some dialogue options, it's because they are mostly irrelevant in the situation. If I had made a map with every single dialogue choice in the game, it probably would look more like a mess than a map.
There are also some explanations about game mechanics (or, at least, as I understood them while making this map).
It may be incomplete, especially regarding the Voices that will accompany you on your path. It doesn't have any achievement marks, but you will collect around 90+ with this map (I collected around 94 out of 97 just while making it).
I hope it will help you explore the depth of this game and enjoy it to the fullest.
Upd: changed the link to a more readable image in better quality
Upd2: added a link to the map in the editor.
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