This is not exactly an easy concept to use in an app. I also, as a hobbyist programmer, understand that producing a satisfactory product is no small task. Now, you, the developer, who is doing this for a living, if you want to not just be a good programmer, but a great programmer, you should take my feed back as constructive criticism, and not just some whiner complaining that he or she had their money taken.
Their is one key issue with your app, thats usability. May sound sarcastic, but that is critical to success, its why people like gates and jobs have, and in the later case have had, a crap ton of cash. Their software was user friendly.
The issue with yours? As at least one person said, you have the scroll speed set real low, that isnt exactly a good thing with pov, and its also a fixed speed, you could do one of two things, allow users to set the scroll speed themselves, our take data from the gyro, and accelerometer, and use that to alter the scroll speed in order to make for a more consistent message, in then end, improving user friendliness.