In order to get the hyperlink working, I would have thought that you’d have to do something like this:
<a href="https://www.criticspeak.com" title="Critic Speak" rel="home"><h1 id="site-title"><span>Critic Speak</span></h1></a>
because your negating your text-indent to hide the title text, it’s also taking away the anchor that wraps it.