I've heard a few of his tracks. But I like what I've heard. It's awesome that he made the ump from Death Metal to hip-hop.
Nightmare on NES?
http://www.youtube.com/watch?v=9YpFdFh6R6k
Listen to it again, I think you mean Metroid.
http://www.youtube.com/watch?v=RZnEzNDktdE
The soundtracks are eerily similar though.