That is a very creative way to expand on the gameplay, Adding a shop like section is something I was originally trying to implement but had to cut it due to the time constraint, I also love the idea of having more interactions with the boatman as *spoilers* it makes the final fight way more heavy in regards of the narrative *spoliers*.
I don't really understand how PCG can be implemented in this sort of gameplay but I would love to hear more about it.
Thank you for such great feedback and advice, I really appreciate it.