I've finished playing through Chapters 3 and 4, and it saying it was insane would be an understatement. Along with that, it also had a lot of implications relating to what this fangame is about. The dark fountain in the bunker, Undyne being brought down there, the door opening at the end, and the Knight's identity being basically confirmed.

Some of the story elements are definitely going to change with this new information, which isn't a big deal. However, there's also something that happened that would also affect the Kris fight.

Because the fight with the Roaring Knight broke the order by using the red soul, but Gerson's fight used the green soul. I think that if something like this does happen in Chapter 6, it will use the blue soul. Seam also confirms that we will only be having 5 Shadow Crystal bosses, so I don't think that we'll be getting the orange or cyan soul-types in-game.

Despite this, I will still be making this fangame with the orange soul. I made this choice because I already made it work, there are enough fangames that use the blue soul, and I just think it's cooler.