How to Build an NES Game

I've been really big into retro gaming lately. I was talking to someone and I was like you know what we should build a video game. And so I kind of came up with this concept for the video game. So I'm using this program called Nest Maker. It's a really really cool program that makes building an actual NES game so simple. Oh wow. I didn't realize how limiting. Everything in NES game is like it is crazy.