Customize World & Save as Static Map

Editing/customizing the world and saving it as a static map is similar to save your game and using the saved game as your world map (as Minecraft does).

In Voxel Play, enter playmode in Unity Editor, edit/place your voxels and save your game as described here.

Then use that saved game as your starting world.

If loadSavedGame is set to true, the saved game specified by savedFilename property will be loaded when game starts.