To start:

Once you have created your world and added the datapack to the datapack folder, type /reload
About:

This datapack spawns lava over your (and every other players) head every 2 seconds. Settling down and building a nice cozy house is no longer an option. How will you adapt? Live forever underground? Always on the run? In the Nether under the safety of the Nether roof? It's up to you...

Warnings:

You CANNOT change the name of the pack after you add it to the datapack folder. If you do, the stop and restart buttons will not work

You must have cheats on at least until you type "/reload"

There are moderate amounts of particles spawned by the datapack

The lava is very hard to clean up after it starts