Ths game has great potential but needs some updates first. these are my suggestions.
Different types of trees and plants that give other foods
furniture which can be created e.g. bed to sleep in
traps that can catch fish and the shark
different modes easy, medium and hard
easy is one shark
medium is three sharks
hard is 5 shark
day/night cycle
different weapons which have higher damage
scrap metal creates armour which give extra health
options and control settings
blueprint mode which people can install other peoples rafts