Excellent concept for your submission, very impressed by it and the execution (it was like the duets tracks from my submission but taken to another level wow) !
The tracks are all very nice, the music battle aspect was very well executed (reminded me of The Devil Went Down To Georgia or Guitar Hero boss tracks in general) : the parts to play are nicely composed and memorable enough to not be a bunch of notes put there to be difficult, so great job on that. The rise in intensity/difficulty was quite well handled, and there was a lot of very enjoyable variety among the different tracks.
I leave this comment as is but I will try later to play it on guitar (very fortunate that you put the tab notation on here, my non-sightreading brain would have been very lost otherwise), I will tell you how this goes in another comment.
Excellent work and can't wait to try it out, great job !