My God...
Dude, this is your 1st submision to the portal?!? It's absolutely incredible!!!! =D
Unlike 'DJ-HappyFace' before, I would say keep eveything in the theme, it's perfect as it is! ;)
I can just imaging a final fight between Sonic & Metal Sonic in a Catheadral, or maybe, a fight between Hyper Sonic & Metalix (or whatever the giant red transfromation Metal Sonic had in 'Knuckles Chaotix) in the Hidden Palace Zone... oh God that would be THE most Epic & Incredible moment in Sonic history!! =D
Anyways, It's awesome to know that you remixed such an overlooked (& probably my most favourite of all Sonic themes) theme of an overlooked game, 'Sonic 3 & Knuckles' (the BEST Sonic game yet)!
It's OVER 9000/10 STARS!!!!
Hyper-Shan.
P.s: Can you make an remix of The Doomsday Zone simmular to this Final Boss them? =)