Perk Implementation Manager interview questions

The interview process was ok, I had an initial screening then a couple of rounds with managers, etc, after that I had a take-home assignment. I stayed up almost all doing this assignment (up till 2 am - woke up at 5 am) as I had a very busy week at work. Gave the presentation and had a few case studies, hiring managers were all very nice and fun to work with. The next day got an automated email that I was not chosen. Asked for feedback and got no reply. Asked the hiring managers that I interviewed with for feedback and got no reply. After staying up all night and doing the assignment they asked for the very least I expected was feedback.