So you got cut, big deal. It happened to me before, and it happens to hundreds every year. Just move on and be productive. In my case, I realized I needed to get more into coding, and get a better grasp of everything, which is what I'm doing.
Facebook, Yahoo!, Google, YouTube, Digg, Revision3, Ustream.tv, Qik, Meebo, Delicious, Twitter, Craigslist, HotorNot, etc. all are successful/profitable/growing in popularity and all did it without YC.
If you're confident in your team and idea, stop asking for feedback, you already got the best feedback you could get, that there's 'literally nothing wrong' about your app.
Congrats to who made it, and congrats to who didn't, it's a kick in the ass that should launch you forward.