A few feedbacks from using it (and seeing it evolve) for the past few days (everything is 200% subjective, as one might expect with a theme):

• The "[*\]" aside the word "nixers" is not well scaled and looks bad
  
• Too much whitespace between sections/links in
  
• Font for titles/links to threads are too big and eat up space
  
• Love the colors! They're refreshing and light for they eyes
  
• Minimalistic at will, all important links are present
  
• While viewing the thread, it looks really nice (you forgot to change the color of the nickname, and perhaps add a left-padding to them)
  
• Mobile version is much much much much better than it ever was!
  
• Mobile version shouldn't include the section description though (it eats up space)
  

So overall, you did a fairly good job! Great work, really.
To sum up my though, the only thing bothering me is that many things eat up space on the page, which can be annoying. Not everyone runs a browser fullscreened on a >2000px screen, and thus I can barely see all the links or the first section in the main page.
I'd rather have a bit less white spaces, and smaller fonts for sections titles so that I could see more of them on the page, which would prevent having to use the mouse and scroll all the way down. The same goes for mobile, except for the font. The font size is perfect on mobile view, but the white spaces become annoying (eg, the space between the title and the section name. Another line could fit in there). As there is not "box drawing" to separate the threads, my brain mentally uses whitespace blocks as a separator, and it seems like there are separators everywhere.

So yeah, the only things that really bother me are the whitespaces that are too big, and numerous. Other than that, it's my favorite theme, out of all the existings themes we got! Thanks venam!