Yay, I completed the main story! It has such a nice, weird vibe that is perfectly captured by the art style and sounds. I especially liked how the sounds changed from basic to legendary fish - it really gives you the feeling that you've caught something stranger and more valuable.
Oh and I also liked the inventory management; it suited the game well.
I found the fishing mechanic felt a bit repetitive after a while. However, I still wanted to stay in this world because of the story and the desire to catch new fish (their descriptions added so much to the whole atmosphere).
Nice game! I really liked playing it and enjoyed the vibes!