If you’re completely new to Haxe, you will have to setup the environment and install the necessary libraries first. Follow the steps on the link below.
http://haxeflixel.com/documentation/part-i-setup/
In a nutshell, if you only want to use HaxeFlixel to make your game, you will need to install the first four things on the list written in the page — Haxe, Lime, OpenFL and HaxeFlixel.
If you’re on Linux or OSX, you do not need to follow steps 4 and 5 (installing FlashDevelop and Flash Debug Player). We will be using Sublime Text as a replacement, which will be covered in the next post. Stay tuned!