haha that song sounded really familiar, it must be from a game i played before.....
there's lots of similarities between metal and game soundtrack, and soundtracks in general .... you can tell those japanese guys programming Contra in the 80's listened to stuff like early metallica and megadeth.
anyway there's some fuckin brilliant work in those old 8 bit games, considering you hear nothing but 4 generated waveforms and an occasional pcm....