Feedback for a New Music Training App

Hey Everyone,

I am helping to create an interactive music training app that will help people train/practice and learn about music theory. We are still in the early stages of creation but we would love to have some feedback and find out what you think about the site. The app is currently free and we genuinely need the input of musicians and people interested in music to ensure that we are doing work that people will find useful.

Feel free to be honest and constructively criticize away: https://pitchplay.io/