Hello @bastecklein! In case you don't want to use my .c2d file, I have all of the dusk world models here in this handy .zip file if you want to manually add the worldtype in yourself!
Alternatively there is the .c2d file.
Ape Apps, LLC is an independent software development company founded in 2010 by Brandon Stecklein. Over the years, Ape Apps has published over 400 apps and games across various platforms. You can get in touch with Brandon on Twitter or by leaving a post on his wall @bastecklein