Good, Alex is still stiff. He has removed my feedback using the Upwork tip but I needed to comment here again.
I left him 0 stars because I was not sure which of us was a real customer. Alex might have a few skills but his attitude and availability were too bad. Even if he was on Slack, he didn't work on my project. He said something about his aspiration but Alex, please don't make me laugh. You cannot become a famous inventor like Newton or Edison. Anyways, his conversation made me piss off occasionally/frequently but I tried to be patient.
I think that was why he thought me stupid and tackled me. He dares yelped me to find out new developer even though the project was not so a big deal. I have tried to convince him to stick to this project and I have suggested speeding up the progress due to my customer's deadline problem.
However, he was an extremely selfish person whom I have never seen before. He is nothing more than a developer but he wanted to do games with customers.
Don't hire him at all.