Looks great, one thing that is not usable is the video player, it only has a play pause, I wanted to seek around to watch bits again, you need a video player with good usability if your app has good usability (which it looks like it does!). That video player might be the first click or interaction a user is having with your brand, it should live a positive imprint on them, not a feeling of fustration. I wanted to watch more of your app being used in the video, go back a bit and see it again, and I couldn't jump around the video.

Hope this is constructive, I don't mean to be negative, the app looks fantastic!