The game would be more fun if there would be more things to build like tabels, beds and chairs. It would also be nice if there would be different seeds like carrots or tomatoes. It would also be fun if you could dive to the bottoom of the ocean to gather things like chests or so. Also, there could be different fisching rods that the player has to make to get better fish. New textures or different materials would be fun, forexample if you could add armor to your foundation so it is harder for the shark to destroy it.
Ps: Love the game, already made a huge raft with more than 15 floors. XD
hope you like some of the ideas.