Suggestions:
difficulty level
a day and night cycle
a beds and torches/lights
crouching
setting to turn off shark/health/food/water/infinite items/etc. when map is opened
walls protect from shark
underwater! exploration and collecting items from underwater
boats
island
storms which require you to get into and enclosed space
more creatures,
I have a ton more, but understand that the game needs time, good game so far though