I've been working on this world for quite some time now. This world is an Island Survival.
You do the same thing as in a normal survival world but now all the biomes and even the underground are on islands.
Even though I have finished the world, I would like to add new islands which you can suggest in the comments.
The size of every island is 9X9.

LIST OF ALL THE ISLANDS
Plains Island
Gravel, Coal & Iron Island
Forest Island
(not so)Extreme Hills Island
Ice Plains Island
Desert Island
Jungle Island
Swampland Island
River Island
Ice Plains Spikes Island
Mesa Island
Savanna Island
Lapis & Redstone Island
Ocean Island
Mushroom Island
Villager House Island
Cursed Villager House Island
Emerald, Gold & Diamond Island
The Nether Island
Nether Fortress Island
Wither Summoning Island
The End Island

INSTALLATION GUIDE (Windows Only)
1. download the island survival file
2. extract the zip file
3. drag the folder inside the zip into C:\Users\USERNAME\AppData\Roaming\.minecraft\saves
4. launch minecraft

Then your finished.