Excellent cover.
This is exactly what I'd expect out of a great cover. Definitely good enough quality for Guitar Hero license to say the least ;-]
I can tell you put the straight week into processing. That's why this is going to stand out so much from most of the rest of the NG tracks, the authors of which don't normally put in the time nor have the equipment to really fine tune a sound like this.
It's been awhile since I heard the original (at least a few years, unfortunately) but this is one of my favorite Kiss tracks. I always like seeing how cover artists apply their own available equipment and talent to the task of recording famous material like this, and when done right that should result in a subtly new take on the original. This definitely showed that to me.
But what I really liked more than anything was the way your band really pushed things in the at the opening and the conclusion. The acoustic opening was phenomenal and perfectly fitting, and the transition to the concluding acoustic part at 4:37 really made this exceptional. I wasn't able to find any version by Kiss that did this, so I'm assuming that was entirely your creation. Great job on that.
Normally I have trouble giving too high of a score on a cover, a cover being what it is, but in this case your band truly deserves the 10 for all the work, creative and technical, that went into this. Fabulous.