First off, what a great game! It has so much potential. There are a couple of things that my wife and I have thought of while trying your game out. A
- Weather system with rain, lightning, waves that can damage your raft/ways to fortify foundation to counteract it
- Water purification system that has a hose in the sea leading to a tank or possibly barrel to hold it
- Upgrades to equipment: water can, canteen, camel back. spear, harpoon, gun.
- Character level progression/ gains experience for building items and equipment, killing the shark, ect.../ The higher the levels the longer you can last without eating or drinking, faster swimming, longer fatigue time..
- Furniture!
- New item ideas: Gunpowder, wooden rod, saw, flint
- Possible story idea: You have a certain amount of time to survive before getting rescued or reaching an island. The longer you last the harder it will be with the weather getting harder or more sharks or the shark having more attack damage.
That's all I got for now! Hope it helps!