I like the "similar to last selected" bit though I wasn't sure if it always worked very quickly.
Also, on a typical screen, it required a bit of scrolling around to see the day plus the "next day" nav. I wonder if you could tighten things up a bit for fairly busy schedules?
Showing promise though. Don't give up.
Clearly YC applicants are getting much better for them not to even give you an interview.
Where are you located, and who is your team?
We're located in Melbourne, Australia. I was a senior software engineer before and so was my co-founder. We are in our late 20s and have both quit our jobs few months ago and could relocate.
I think the applicants this time round were very strong!