I've noticed that when you install haxeflixel and run:
haxelib run flixel-tools setup
It asks you to create a symblink for sublime as the "subl" command.
However, the suggested line is old, refers to sublime 2, and is not located properly (~/bin/subl is not the correct path).
Please have it replaced with this official sublime command, that also creates a symlink (and not hard link), and to the correct path:
ln -sv "/Applications/Sublime Text.app/Contents/SharedSupport/bin/subl" /usr/local/bin/subl