I played this game about 5 times and in total it took me 20 minutes.
Firstly, I really like the concept of your game and even though the game looks simple you can tell it's really fleshed out already by your idea. Secondly, I like the waves' textures because they look pretty cool.
One suggestion I would make is maybe you can make the waves move up and down as well just to help us become more immersed in the game. Another suggestion would be to make the controls a little more boat like. Boats don't usually go to a stop that easily.
The first bug I experienced was some of the waves actually didn’t kill me so I kind of just went inside them. Another thing that isn’t a bug but I was disappointed when there was no island at the end like I was promised ):