Also, the original mixer was shutdown almost 1 year ago, as mentioned above
It's been actually almost 2 years since the site closed.
Back to OP; there is no way you are getting your coins back, and the reasons for it have already been mentioned here.
What surprises me, is that coinmixer
.es appeared some months before the owner decided to close shop; and it's been more than 2 years from that. That's a lot considering it's a phishing site, but if it still works....