Today, everything with a guitar tries to call itself metal.
Nonetheless, I often listen to the Soundtracks from Epic Score (
http://www.epicscore.com/) while playing Crawl. On the other hand, when I'm playing Castlevania Roguelike, the only reasonable choice is to listen to Live House S.S.H., especially the song: "Travel Demon" (
http://ssh.ne.jp/ -> mp3 -> it's the link above "Big Blue"). Transcendence (new version out btw) is often accompanied by listening to E.S. Posthumus.