I'm new to coding and would really like to build a game similar to Fall of Eden. I love the class system and everything! I've been practicing using Twine but its difficult to code a combat system with classes and skills and all of that jazz. So I was planning to take a look at your code and came across the article on github that says "to build the game". I tried running it the way the instructions listed but came up with an error "$npminstall is not defined". So my first question is, is this a way to build my own game in the Fall of Eden format and if so how do I fix this error?