Although the sequencing may be utterly masterful - I wouldn't know, myself - I have the same complaints others have mentioned.
I cannot hear the original melody in here. I played through this, then went directly to my MP3 of the original... I still couldn't detect any similarities. That in itself isn't enough to ruin the remix for me... after all, I've enjoyed remixs of music from games I've never played or heard before.
However, this remix... just doesn't seem to do anything for me. There is no emotion, no sense of... anything. It's just a bunch of piano keys, and that's how it sounds throughout the entire thing.
In the best remixs, I get swept up, I forget to identify the individual instruments, and generall some emotion is inspired. This remix doesn't even possess the barest shadow of any of those qualities.