Sounds familiar.. I made a similar app last year, and had to add features - the ability to track a number of questions, curved thumb sliders, social media integration, etc. but it did get accepted, and has been doing pretty well.

Like this, it started as something I wanted to use, and grew from there. slidersapp.com if anyone is interested.

(I am wondering where to go with it next... online platform, android port, etc.)