I had the exact same experience, around the same time. I just assumed I was a bad fit, but it would have been nice to know why. The company seems pretty cool, from what I could tell.
I'm very sorry for that. Sometimes we miss a follow-up and I always hate when it happens :(
We will investigate this case and I'll send you the result within the next 2 days.
> 1st phone interview (screening) -> 2nd phone interview (technical) -> [crickets]
I get it, we are all busy, but I think sending a "No, thanks" email to applicants who have spent time on your interviews isn't asking too much.