At the speed of meh... (please read entire post)
Did you even use the original Metal Cap song in the remix? I really don't think hard-core is the term you're looking for, it's too slow for that title really, plus it seems to be more of a chilling style music if you called it "Invisible Cap SE- Chilling" instead of "Metal Cap SE- Hardcore" I might have gave it an eight or a nine. Granted some parts equaled the original in speed or surpasses it for a few seconds but it really sound like someone turned up the RPM on a record player. The original instilled a since of "run as fast as you can into as many enemies as possible crushing them under your might" and not "please take you time, there's no hurry. We have some cake in the lounge if you would like some." Really this is an identity crisis, you placed gave me an expectation of exploding busses but what I got was a beanbag chair and Cheetos. You may have found yourself in the wrong crosshairs because when I hear the word hardcore things like Predator, Quake, Unreal, and so on come to mind so I was expecting face basing music.
If I had never heard of Mario or played the games (or at least Super Mario 64) I might have gave this a higher rating. It's a good song but when you attach certain titles expect some flack especially if you decide to seeming throw out the original song in favor of a new angle of it.