Falling of the world
- Double tap Space to fly.
- Press <kbd> C </kbd> and hold it.
- You pass thru the floor and keep falling forever.
- World moves away quickly so you dont notice you fallen from the world.


If you walk to the world border you also fall of the world too, 
maybe world border should have an invisible wall or teleport you to the center again, whatever is easier to implement.

Maybe a key to teleport you to the center of the world can be cool too.
