Do you have analytics on if anyone checked your demo?
Not a lot of people would have the analytics in place, but it would be interesting to further correlate results with YC demo testing patterns to get a more complete picture of the admissions funnel.
We applied for W15, not this round, but our video was watched in full 4 times from SF, Mountain View, and NYC. Our demo was accessed 8 times from the same cities, and one message was sent through the demo account (it is a messaging platform). No interview granted. I think we have a strong team who has a history of shipping, we have known each other for a long time outside of work, but we were just at the prototype stage...my guess is that a little traction would go a long way.
Not a lot of people would have the analytics in place, but it would be interesting to further correlate results with YC demo testing patterns to get a more complete picture of the admissions funnel.