This is an incredible game! I saw the comments below so I will try to not repeat the same feedback, since most stuff was due to bugs. This was a great narrative game. The writing is really good. I am sure many people don't love reading that much, but it's very well written. I really love the earie vibe and the Dredge inspiration to it. I love the music elements as well, in the last scene I got goosebumps :)
For the gameplay:
-It took me a while to get used to rotating the camera with Q/E. I don't know if it would be better to use the mouse and change the interaction to a button. But it's probably bc I am not used to it.
-I wish the dialogue showed who was speaking ( I got confused sometimes).
-I also ended up in the heart before I explored everything. I realised that when I was reading the book and it said "Empty page you turn the next one" or smt similar heh. And I was sad. I wish I had a map or something similar to guide me. If I knew I was heading toward the heart I would turned back.
-Also, as ppl pointed out, I didn't realise that I could upgrade my boat by returning to the main dock.
-Something that I would like is for the music transitions to improve. At some point, I think it was before arriving to the heart, the screen went black and the music stopped very suddenly, and it took me out of it.
-Ppl already mentioned this but subtitles at the start of the game would be helpful for ppl like me who watch everything with subtitles.
Overall, great work! :)