It doesn't use the default Oxwall Mobile theme unless you have that installed.
This turns your current website into an app, it doesn't provide you with a design.
It literally has zero control on how you make your website look, but will show what you have set.
Other users like Patricia have done the responsive desktop themes and they work fine, although we never got her customizations finished, because she wanted stuff that it wasn't ready to do then.
AGAIN IT WORKS WITH WHATEVER YOU HAVE AS A THEME!
I use the Native Mobile because I am working on extending the Mobile Version for AppXprt and Scene.
Hope this helps :-)