Hi! I'm the maintainer, and I'm glad yinz are enjoying rustlings :) I don't have any plans to do this for other languages, but please feel free to start your own!
If you have any particular Rust concepts that you'd like exercises for, please let me know here, file an issue, or even contribute an exercise! Errors that you've hit that took you out of your flow of working on something else are great candidates. I haven't been adding new exercises recently, but I would like to continue expanding.
Thanks! <3