Menu artwork looks beautiful! Background image was a bit blurry here, or that's just the way it is?
Performance was good on my old android phone.
I'm guessing you didn't draw those fish sprites yourself? I think your game would look a lot better if you drew everything yourself. Also the fonts used looked a bit to plain for me, you should experiment with a bit more "fisherman" style font.
Also maybe you could change the way of dying a bit, set the hitbox to only the front of the mouth of the fish, because when you bump into it's fin now you die too.
All in all, I played it for a bit, like the concept, but I think you can do a lot better and more with it.