Thank you for playing!
We wanted to make giant fish eating the player as cinematic as possible, but unfortunatly didn't have too much time for that. Making the sound react to it's approach is a great idea we will look into in the future.
The best way currently to catch fish is to swim around and search for it (because of the way AI and fish spawn works), or even better get eaten and look for fish inside the giant fish. Right now it's very common for players to play safe or even avoid giant fish entirely. In the future we will look for ways to provide more information to the player without breaking the element of surprise.
Thank you again for your feedback! Glad you liked the game!