but this was not heavy metal like you put it in, but thats not why you have low scores.
orrigonality so low, because this song has been covered countless times
diversity, because it isnt a very diverse song. ever.
effort, because you did the whole thing in fruity loops, instead of using a real instrument.
to hide the FL sound in the future, i recomend doing the slayer part in acoustic mode, then adding distortion with virtual stomp boxes. you can make it sound like a real guitar then.