I'm liking it so far! Especially like that subtle triangle with the translucent backgrounds. It adds a nice touch.
I also think it's interesting how pairs featured posts are mixed in with the latest posts. It solves the problem of featured content being relegated to normal chronological post status when it's pushed off of the "main" featured content display (however many posts it contains).
The way there's a fixed bar when you scroll down on single posts is also pretty cool.
Here are some things that could use some improvement:
Continue reading button
I'm wondering if it would look better with more of a button-style "Continue Reading" link, instead of a blue text link.
Featured Posts vs. Latest
I think it would be best if this just said "Featured" instead of "Featured Posts."
While "Posts" makes sense to us WordPress people, it may not be the preferred nomenclature of the site operator, especially on a magazine-style theme like Carmack who may prefer "Articles" instead.
But to keep things simple and consistent, I'd just keep it as one word, like what you did with the "Latest" heading.
I'm not a big fan of CSS hyphens, because they randomly hyphenate words that don't really need to be hyphenated. For example:
I know you're doing that to prevent super long words from overflowing past the container, but I've found that using
white-space: nowrap; is a better compromise because it only affects words that really need to be cut off, leaving short words like "number" and "broken" alone.
It's a tricky situation because nowrap doesn't hyphenate the words, it just shoves the extra letters to the next line, which might be confusing for readers.
In the Owari theme, I used
overflow: auto; to add a scrollbar when words that are too long are used. It might be ugly, depending on how the browser treats scrollbars, but it prevents layout issues and unwanted/confusing word breaks. Might be something to consider as well.
Slider usability, especially on mobile
I noticed the featured images in the slider are clickable. This might pose a problem to mobile users trying to navigate between slides with these:
If they miss the target, they'll inadvertently get directed to a page they didn't intend to go to, or another slide they didn't intend to go to.
I haven't checked on a mobile device, but swipe support on slides would be nice if it's not there already.
Time ago format
I noticed you had some "time ago" date formatting (for example: 5 days ago) in some parts of the theme.
I originally had this in Adaline, but the WordPress.com reviewer asked me to change it to a "normal" date format due to internationalization concerns.
While I really like the design of the hamburger icon flush against the site title and the menu above, especially when it breaks down to mobile...
...I feel it would be confusing for both the site operators and site visitors to "decide" where to place/find certain menu items.
I'm wondering how it would look if the top menu was just cut out altogether.
Also, the mobile menu looks like it could use some polishing, like some additional styling for submenus: