So I am about to start "studying" this game so I can see how far I can take it, but I wonder if NG+ should be another category since the text flows so much faster and generally, more bearable.

As anybody can probably tell I'm new to speedrunning, so that's why I'm being cautious here. Thanks beforehand!

Whats the difference between NG+ and just a regular New Game?

You can make the text go a bit faster, which in a game like hotel dusk is a big deal. Doing the runs I discovered a way to make it go even faster which I explain in the guide I made