Happy to. Ferret and jank have similar goals, but some key differences:
1. Ferret targets embedded platforms primarily; jank is more general and less constrained
2. Ferret doesn't have a JIT-based runtime, meaning no nREPL while you build your programs; jank provides the whole Clojure interactive programming experience, meaning you can start with a REPL and an empty file and end up with a whole server/GUI application/game without stopping to recompile/run again
3. Ferret is written in Clojure and requires the JVM to run, whereas jank's host is native, meaning its runtime and compiler and both native (C++)
My overall sentiment for Ferret is that it's great and I'm excited that it exists. I have my eye on it so that we might be able to learn from some of the decisions made over there. In particular, its interop and memory management systems are of interest.
Worth noting, when you look at all of the existing native Clojures (Ferret, Carp, jank, etc), only one of them aims to be Clojure source compatible while providing a true REPL-driven experience: jank.
