USAKO-X was a random guess based on "usa," hahaha. The only other guess I have is Kyoko Naka, because she says she both composed and programmed for the game, and the OST credits composers and programmers separately (Yassun is credited as both). But then she'd be credited under two aliases. SNK
And yeah, VGMPF is pretty cool. They contact composers a lot, which is neat; gotta love the social media age. Their Japanese names are teeeeeeeeeeeeerrible, though. I'm pretty sure whoever's in charge of that just uses Japanese text entry or a dictionary and picks a result, based on things like
"甘木市 信じ" for Shinji Amagishi (correct is 天岸 真志).