It's neat to compare Janet to GNU Guile. Guile's original pitch is that it's intended to be easily used side-by-side with C. However, because it's an older language, it hasn't (to my knowledge) picked up newer sensibilities like having a package manager shipped with the language toolchain.
One thing I like about Guile is how much effort they've put into describing compatibility with the RNRS standards. Not sure how Schemey Janet actually is, but I'm curious to find out.