Janet: a lightweight, expressive and modern Lisp
Okay, so when Clojure came along, it came with a strong underlying philosophy of what the language was supposed to be/do. Among them were design decisions such as, e.g.,:  - VMs, not OSes, are the platforms of the future, so target the JVM
  - Object Orientation is overrated, but polymorphism is a good thing
  - Multi-core is here to stay, so use immutable data structures to greatly facilitate writing correct concurrent programs
  - Leverage the strengths of LISP but give it a modern overhaul (most notably, throw in different parenthesis)

Now, you may or may not subscribe to any of these but my question is just: how does Janet compete on that front? What is the problem it is trying to address specifically? I looked at the web page a bit but it's still not clear to me.