> ... a relatively fast functional language that replaces most of the brackets with indentation.

You might like sweet expressions coupled with a common lisp, a scheme or racket:

http://readable.sourceforge.net/

http://docs.racket-lang.org/sweet/index.html

... Or perhaps have a look at Julia:

https://julialang.org/

"Julia - to Lisp or not to Lisp":

https://m.youtube.com/watch?v=dK3zRXhrFZY

[ed: and as mentioned below, there's also wisp:

http://www.draketo.de/english/wisp

]