Slower can be better.
In fact, I've been having a certain artist send me half speed versions of his songs... It's quite interesting, because there's a level of depth that is missed otherwise. So, don't let anyone convince you that slower is worse. In and of itself it isn't. IT's the context of the song.
That said, this song is pretty good. Good variations... But the instrumentation just as a kinda.. Droning quality. Maybe it's just me, but it gets old fast. Maybe change it to be clearer?
~Sir_Furious