Using OpenFL to design a javascript game

I’m honestly looking for any lead on how to begin making a simple rogue-like game and came across a game called “The Enchanted Cave 2” and heard that it was created by using GIMP, flashDevelop, tile, and OpenFL. If I wanted to make a similar rogue-like / dungeon crawler similar to this game, where should I begin? I am still learning javascript, and will likely continue to finish all of my lessons on this website, but after this, where would you begin?

Also, I’m not sure if I can use it, but I have access to adobe creative cloud for designing stuff.