Hello! My name is FitterSpace! Doing a written guide for a speedrun isn't easy. So i made a playlist of videos for each level in this game, with and without glitches. The playlist can be found here:

https://www.youtube.com/playlist?list=PL2isI7chtaALtgexGhCjG_eCT68AYcfJ9

EDIT: callmeliam has made a more up-to-date tutorial for Nightfire any%. It can be found here: