Just shouldn't have the / at the end. Try this calintz.
http://www.youtube.com/manta2015As for the quality, I'd say the best arrangement/performance you have is the Xenogears track. It is on par with people like Michael Gluck (aka "Piano Squall").
Manta, you should consider getting involved with people like OneUp Studios, Overclocked Remix, or even working duet tracks with Michael Gluck. All of these people/organizations are very easy to contact, all you need from there is motivation.
I wouldn't normally say any of this btw. I clicked on the link feeling very skeptical...a lot of those YouTube VGM on piano videos are, for lack of a better term, crap. Just pure crap. But your work is good. I'd love to hear you do some more Xenogears, and if you're up for a real challenge, try to do some Masashi Hamauzu by ear (Saga frontier 2, Unlimited Saga, some of FFX, others...)
Ramza