Here is my suggestion,
Here's a demo video with most of the things I listed below :)
https://www.youtube.com/watch?v=0lYnblP4jxI
1 # Pirates, when creating the pirate flag altomatically starts a count, when finishing the count the pirates attack your raft, then you must prepare the maximum to receive the attack and survive.
2 # Solar energy and oil, these 2 can serve to supply defenses weapons or boats, "remote control boats that watch over pirates."
3 # Water Bench, where you put 10 cans to refill and refill with empty cans.
4 # Increase the number of items you can hold from 10 to 15.
5 # System of cold rain and heat.
6 # Night and day system.
7 # Sleep.
8 # Fishing more difficult, water more time to be ready.
9 # Other types of shark, differentiated by size and color, more dangerous and more damage to buildings.
10 # Walls serve as a foundation.
11 # Shark wires.