Why cant people be like you?
Seriously, your one of the few people out in Newgrounds who can actually take a song and put creative effort into a music score. There is nothing I could possibly say that could make your Doom Tracks any better. They are already amazing the way you composed the scores. Kudos to you, and I hope to hear more!
Oh, might I make a suggestion for another Doom score? E3M3 would be absolutely perfect for your kind of guitar skills. I think it would sounds pretty damn good.