Zaubar Fullstack & Unity Developer interview questions

I received an invitation to speak with the CEO of the company and we schedule an online talk. This happened after about 1 month after I applied to the company. At the day of the interview, I logged in 5 minutes earlier and I started waiting...5 minutes, 10 minutes, 20 minutes, nothing. After half an hour I sent him an email asking if something had happened and that I was open to re-schedule. He never answered back. Absolutely disrespectful behavior.