I've been using the Android version for a while now and noticed a couple quirks with the way it implements full screen. I compared its behavior to that of Netflix and YouTube, for reference.
First, when navigating media, the app is already using full screen mode. This means that to use my "back" soft key, I need to swipe up first to show the key row. Neither of the other apps do this, and I can't think of any advantage to behaving this way.
Second, during playback, the entire screen is used for swipe gestures. This means that it's impossible to swipe to show the navigation buttons without also rewinding the video. On the other apps, when you tap to show the control overlay, it includes a button in the upper left hand corner to either minimize video or go back. This world be a good solution. Alternately, disabling swipe gestures while the controls are showing, or on the left hand edge of the screen, might also be a good idea.