how about : 1. more fish variety with different effect ( poison, make more hungry/thirsty , the fish have different percentage for the hunger)
2. more crafting recipe/ingredient
3. add some more room to the storage
4. add different weapon for killing the shark
5. add more enemy ( more than 1 shark, another killer animal like eagle, seagull, and orca )
6. how about some way to going in to the water
7. maybe a little island ?