Wow, you sir did a great job.
You did more then just play the dungeon theme with electric guitar and double bass, which is what many may do when they make a "Metal cover." No you threw in your flare, and it was quite the good flare. I did just a plain cover of this song on YouTube and it was quite hard. You did a excellent job, looking forward to more of your stuff.
Also, what do you use to record? Your lead tone was epic!
~Zero1996