Wondering about the REPL and interactivity

So after checking out the repo and firing up emacs, loading the mode-intro.fnl file and starting the repl with "love ." I get a love2d window running the minimal contents. So now I would expect that changes in the code of mode-intro.fnl would be compiled and send to the repl, e.g. via C-c C-r and that the changes would be reflected immediatly in the love window, like a simple love.graphics.print, but it is not. What has one to do to achive this ? Or is it not supposed to work like this at all?