You have high quality samples, but they aren't necessarily sequenced in the most pleasant way. Arrangement is somewhat effective and haunting, though pretty simplistic, especially compared to the original. Some jarring transitions here and there. It does get quite repetitive eventually, as the mix doesn't seem to be moving anywhere or building up to anything. Dynamics are very important in orchestral arrangements, which is related to my biggest issue with this mix.
The main problem with this is the mixing. Holy crap. I know youtube compression can be a bitch but that's nowhere near the main culprit here, especially considering the arrangements on your website seem to suffer from the same issues. Aside from the intro, the song seems to almost constantly be on the same dynamic level, and everything feels very cramped and overcompressed, despite not even being that loud. It's as if you slapped a limiter with a high ratio/low threshold on the master track. Panning and sterio field seems pretty solid.
Get your mixing sorted out; turn everything down, remove any compressors and limiters, and start from the ground up.