A Fishy RPG is a game focused on survival and exploration. It's also a fishing game, in the way that this is the main mechanism to gain experience, improve your stats and progress through the game.
The main objective is to find the legendary fishes. In order to do so, you must improve your stats to be able to explore deeper caves and also improve your fishing rod to be able to catch rarer fish easier. Even though the game is built towards a specific story, it also offers the possibility of free exploration in a procedurally generated universe.