>Another use case I've heard from it is as a more app-level language (i.e. a really small Roc platform). Do you see it competing with Gleam for server side http code? Do you see it competing with Elm for client side code?

For sure! I've been using Roc for work exclusively for the past year and a half, writing mostly full-stack web apps, and it's been great. I wrote a small framework/platform (https://github.com/niclas-ahden/joy) which is similar to Elm or Lustre from Gleam.

Previously I used mainly Rust/Haskell/Elm/Ruby/Python and each language has its pros/cons, but for web apps Roc really hits the sweet spot of: runtime performance, compilation speed, strong type system, error handling, and ergonomics. It's definitely worth a try!