Hey Riley! Thanks for making this cool game! I played it with my partner a few weeks back and wanted to share the finished compilation with you: "swym: Andromeda and Seethros" PDF via Google Drive
In addition to the letters it has a handful of really lovely illustrations (my partner is an artist).
I was also inspired to make my own one-page letter-writing game, which uses similar mechanics but is post-apocalyptic in theme.