Don't you even think about changing that name.
Since it's more of a generic dungeon theme in the game, if you want to make it specific to Alph, consider incorporating Unknown sprite noises or maybe the 'mysterious radio signal'. I can't remember what it sounds like, but it could help. The DS remakes altered the theme slightly as well, but it probably wouldn't be much help, especially since the mix is 'finished'.
Sounds great.