Remote app, take a look at the video

Check the video to see how this thing should work - https://youtu.be/xQP9Gf9yQkc
Imagine that you're watching movie on your PC and you use this app as a remote. Just put in on the table, or sofa, next to you, and by rotating your phone you adjust the volume. When you want to pause the movie, just turn the phone more, until it pauses. If you pick up the device to do something else, it just stops working, so you don't have to worry about unwanted volume changes. When you turn the phone upside down (display on the surface), you can rewind the movie the same way as you change the volume.
This remote could be also used for music listening for example through airplay, when you have no cables attached to the phone. You could go to next track by double tap anywhere on the screen.
Let me know what you think about this UX concept. Would you use it, if it was in appstore?