So I took a closer look at it and I think the gray is too bright and the font itself... Well, it isn't too bad, but I wouldn't consider it elegant nor readable.
Apart from the font, I like the clean look and minimal layout.
I hope this feedback helps to improve the theme for future versions ;-)
Worse, in trying to get some of the designer's own guidelines on the font's usage (designers generally are good about letting you know what they think their font is useful for), I find it is clearly a commercial font that doesn't have an open license, so this GitHub repository shouldn't even be distributing it.
That commenter is also right that Futura PT is a commercial, closed-source font, which makes this entire thing rather moot until this is fixed.
Also: if you're going to include custom typefaces, for the love of all that's holy, please include the italic and bold versions of the typeface if they exist and you expect users to use them. Letting browsers make fake bold is bad enough; letting them just slant text to make fake italics is eye-bleeding.
Unless otherwise in dire need and the design is really augmented by a custom font, I'd like a thing for the web to stay with standard/system web-safe fonts. It works and can still be a really well-done typed website.
Something easier to read, and—to match the posts description—elegant would make this a much more attractive theme.
Not that it's hard to swap it out for anyone who likes the theme otherwise, but worth considering changing since first impressions will influence downloads/usage.
Otherwise I think it looks great though, nice job!