I like the crispy-ness, but it may be too crispy for it's own good, IMO.
To me it almost looks unfinished, or broken -- as if you made a typo in your style.css or something :)
e.g. it looks like the entry text is just kinda going off into a right border of nowhereness. And we know the footer is centered across the full blog, but when you're at the bottom of the page and only see the main content, it looks off kilter.
I think a very light gray (maybe very, very light if you wanna keep it extra minimalist :) border around the entire thing, and maybe a super ultra light gray background or right border in the sidebar would help both of these a lot.