Hello I'm actually doing a Youtube Series on your game and I absolutely love it! I love the newest updates. I think the weather cycles like Notreamitielove suggests would be great. Maybe if possible add birds flying around.
A friend of mine thinks it would be cool to be able to dive underwater. I think being able to make shark armor would be cool so that you can swim out to get things with less risk of dying from the shark attack. Maybe after a certain period in the game add more sharks that attack at once than just the 1.