well....
Nice, it was a bit repetitive, could have some sorta of I donno change in it. reminds more of theres something wrong and we need to get there quick background music, It doesn't realy have a boss battle feel to it. nice start though, Karasu is a cool name too, I have a song called karasu I'm working on at the moment (blah blah blah) well great work.
-Shinny