While I was at a startup recently, I did all of my frontend development in Backbone.js, this app would do a lot better in that framework.

Also, the CI framework isn't all that great, I would have certainly used a different framework. Perhaps even Node.js (which is what I'm doing a lot of my development in nowadays).

I also would have looked for a marketer and devoted more time to the project. The market for this kind of product is very crowded, but there is a lot of room for innovation.