If you own marble it up already, you get this upgrade for free. From their websites FAQ:
"What if I own Marble It Up! already?
If you already own Marble It Up! on Steam, you will automatically be granted Ultra in your library upon release.Current unlocks and progress will be retained in Marble It Up! Classic.
For owners on Nintendo Switch, we’ll be sharing more information on how to grab Ultra free of charge. (You’ll also be getting the preorder bonus!)"
No prob! This new game looks a bit more enjoyable, just because the world stays level and you directly manipulate the ball to move it around. (I never got the hang of tilting the level in Neverball... always liked the game more in theory.)