I'm not familiar with NaCl, websites that don't seem to have been updated in 7 years (version states 2016?) make me a little suspicious about the future viability of said projects. Perhaps it's not something that needs to be updated very frequently, but my knee-jerk reaction is that it looks abandoned, especially considering that they have an "upcomming features" section.

What made you choose it? Could PGP/GPG with ed25519 keys not have been sufficient? What makes NaCL "fun to work with"? For me, fun to work with would be Age [1] or Ring [2] with a elegant and well designed API. I'm also aware that the older something is, the more likely it has undergone peer review and security audits, unlike new Rust crypto libraries.

[1]: https://github.com/FiloSottile/age [2]: https://github.com/briansmith/ring