Hi Matt.
There is a really tiny bug, where scrolling in a code block that has horizontal scrolling causes the copy icon to move with the content. It makes reading the code under it a bit difficult.
I suggest dimming the background around the icon so it's a bit more visible, and fixing its position so it doesn't scroll with the content.
As a side note, I really love how code does not wrap in code blocks. In a code editor I want my code wrapped, because I want everything visible. But in a note app, I want my code to be tidy and don't mind the horizontal scroll. Mochi is the only note app that does that. Among other things, it's these little things that made Mochi my #1 note-taking app. So thank you!