The Galactic Park (虚空, Kokū, Empty Space) is a world accessible from the lavender temple in Theatre World.
The Galactic Park is a world filled with many paths made of blue clouds, some of which are filled in with water. Strange bug-like creatures flit around the clouds as a beautiful starry view scrolls by from beyond the abyss, and many blue Vending Machines can be found among the heavens. When you enter the main area, the lighting will alternate between daytime and nighttime.
There is little to do here other than bathe in the clouds or buy drinks at the vending machines. The bug NPCs will react exactly the same to being interacted with, even if you have the Chainsaw effect equipped. In the deepest part of the area is a path which leads to a long ladder spanning the skies, going all the way to the Jade Sky Hamlet.