I like how readable it is. Be sure to handle long lines that ruin page widths on small screens -- probably the commit hash should overflow-wrap: break-word, or in a horizontally scrollable container element, or a similar solution.

One designy thing I've been practicing is to be intentional about every margin / piece of whitespace, and to use a proportional scale like https://utopia.fyi/. You might find that if you align more elements and stick to the scale, things might look extra pleasing. (Maybe you already have, idk, just first impressions from my phone)

- subscribe button placement looks uneven, esp on mobile. Maybe it could be a simple underlined link?

- imo centered text is a crutch that often looks better when left justified instead, or rerranged with some other solution. I'm thinking of the mobile navbar and lengthy captions. This is more subjective tho

- homepage could use more posts! Looking forward to your future writing

- the most beautiful sites usually come up with some unique theme or visual identity or creative stunt to break away from a vanilla default theme. But people still like basic readable websites if the content is great.