My son and I have played a lot of this. It is by and large ambitious, fun, surprisingly varied, oddly consistent, and frustratingly obtuse in navigating between its various modes.
Getting into a movie-themed Toybox is easy, getting into an empty Toybox or one using default blocks from one of the movie-themes is also easy.
Getting into one of the default or figure-specific Adventures is just silly. Players have to be in some form of generic Toybox first, then Start Menu > Travel > Adventures -- This allows going to one Adventure, but instead of being able to go to another one directly, players must quit out to heir previous generic Toybox, then menu it up again.
There's a Title Update out for this today. Not sure if it fixes any bugs, or just adds more Toyboxes or Adventures. Online info only seems to detail the August TU.