> the Y is not bold enough to look much different than a plain orange square
Seconded, it feels like the spacing between the Y and the borders is a bit too large. I would make the Y a bit thicker.
Other than that, it looks good. Voting arrows particularly so. I have memories of browsing HN on the TV at >200% zoom, the logo was very blurry in that situation.
White square border looks good though.
1920 x 1080 on Firefox, plain orange square even more so on the browser tabs.