Awesome run here. Sigma 2 is definitely one of the fuckest fuckers in all of X games when going for no damage. The hand of death is just so awful to deal with alllll the time. Purple squares I never had much of an issue with to be honest, though, but I've also not done any no-damage runs, since I just like to speed.

X6 is the best game, and I've done every challenge you can think of including the one you're going to do, so if you need tips for any specific sections, lemme know hehe. It's awesome.