1) At least a few sounds and music would make the game much better.
2) Description of the control at the beginning would be cool to break apart and show in the course of the game if necessary. For example, while the diver in the boat shows E. When in the water AD and the left mouse button.
3) I got a rope bug when I jumped into a deep cleft.
I really liked the shark, and the fact that the body breaks into parts, a cool effect, the very mechanics of the game is quite good. Good job!