I'm finding that it's easier to write static analysis tools for language X in language X. It's less to think about.
I've been writing an analysis for JS. I really like working with typescript but it's been easier to prototype if I dogfood.
Futhark's design is deliberately trying to stay simple to keep long term design sustainable.
The author also has an interesting discussion of relative versus absolute paths in import syntax, and how relative paths can make local analysis easier.
I've added an eval button to the website of my programming language!
It's a been a lot of work to lock down appropriately. It still needs some UI polish but it's so nice to be able to try snippets immediately.