Here's some ideas:
- do the shark bigger and do that he will do more damage when attacking you.
-Bed, night, day time.
-After killing the shark many times add that a bigger shark (the size of "Megalodon") will come but he won't attak you.
-Falldamage.
-Door.
-More Materials/stuff/weapons (sword,bow).
-Add armor.
-Do That The Potatos will grow slower.
-Multyplayer.
-Rain/snow.
-If you will add snow do that you can make snowballs.
-Do that for the "Cooking Station" you will need planks and scrap to lit the planks and get fire to cook the food.
-Do for the water thing that when you brew the water you will see an animation of water falling to the can.
-After you destroy something to that it will drop its materials.
-Add Soup
-Add Options to the game like audio, graphics, Fog, Screen resolution and more.