I think you should be able to throw the spear and be able to stack them so you can. Also a leveling system so you can add points to do make you better at things like what someone said to add weather so you could freeze to death or get to hot. also add more different types of fish like tuna would give you the least and salmon or something better could work and better fishing poles to get better fish. which this leads me to add that you should add more craftables. More things you could grow. also add more animals that can pop up like whales or sea turtles which could give meat. also armor and more weapons and things that can kill you. also you don't have to lose your raft when you die just your items. Also multiplayer would be nice and me and my friend were noticing that nothing drifts off so right now I have 2 separate rafts that arnt connected. also you could add island which are small but that would be how you got animals and pets and also new trees and by the way its a fact that palm would cant float. also you can get a docking method if you do add islands. also motors so you can move smaller rafts around to other islands. also anchors. And if you wanted to explore add maps and beacons and waypoints to know where things are. lastly I found out that you have to open chests from a certain angle if they are under stairs which there should be ladders because of how much room the stairs take up. also add rubber which you can turn into floaties so you don't lose fatigue in the water. also you can add more crafting tables to get more advanced matirials. also a bed to get through the night. These are only a few of the things think you should add and thank you for reading and possibly adding these things love the game and hope you get more ideas to add to the game because I think you have big start to a big game.
-your gamer friend,DerpyCowMan