Fun and relaxing indeed!
One thing that bothered me was that sometimes it felt like I did hit the "center fishing spot" (I don't know what to name it) but still failed, so to fish succesfully I decided to hit R just when the line enters, right at the edge.
Also when buying something I didn't have any money, but I coulnd't go back so I pressed every button but nothing getting stuck at "Buy", eventually having to restart the game...
(Also not a bother but just in case you wanna polish this little detail, when catching a fish and that box down there appears, if you move the fishing rod disappears, despite remaining on the "Fishing" event)
But for the rest, I liked the game!
(Also when I found Puffarius, my first instinct was trying to feed em with fish lol)