It isn't. But S.S.H. ususes a common synth, Yamaha MU2000 I believe, if not, maybe a lesser edition. But the point is, it's very popular in japanese doujin works. Someone video responded with the source, but they deleted it...hm.
I can't find this song from that link in the description. Can you help? I've never played nor heard about this game, but this song will stay in my mind forever! Just pure awosemness!
I've heard enough songs by S.S.H. to know that this sounds a LOT like S.S.H.'s style of playing, though I can't find this song on their website. Are you sure that this remix isn't by S.S.H.?