Some other suggestions:

1. Add your logo to your Twitter account and get some additional content up there. People aren't going to follow you if you haven't posted anything.

2. Create a G+ page as well.

3. If people are tweeting about your app, you might want to have a running list of those tweets on the front page of your site.

4. Fix the app. I'm getting a "sorry but something went wrong" when I try it.