Heya! Thanks for trying out the demo for Sumer MMario: Other World. 
Released during C3 Summer 2019, this demo includes worlds 1-5, totaling 31 levels. 
There are no playable stages after "World 5, Blueberry Skies 4: The Storm Before the Calm" and "World A, Sakura Mountain 1: Bamboo Heights", so I guess you can call those the end of the demo.
Be sure to let me know if you find any errors!