So I wont repeat what most people have said before. Overall this feels more like a game that was in development before then retuned to add the fishing.
It was a great playing experience, didnt run into any bugs after over 30 mins of playing, loved the multiple islands to explore, loved the fish spawner instead of all the fish being preplaced (unless i'm mistaken). Overall well developed, great level design and very enjoyable.
What i didnt like however was that i was way way faster without the boat. Ik the boat is needed to catch the fish from the schools but seeing as the minigame is just picking them up i should be able to while swimming imo.