This datapack changes the overworld generation to flying islands. Survival becomes much more difficult due to the increased number of monsters (including during the daytime). No ore is generated in the world (except for coal and copper)
New structures and biomes appear (classic biomes have also been improved)

There are 21 biomes in the overworld (13 classic and 8 new)
7 new structures. Many standard structures have been removed from the generation to complicate the game (villages, mineshafts, etc.)
Adventure time achievement changed
The nether, the end remained unchanged

This data pack allows you to complete the game and complete all achievements