A lot of changes need to be made.
Sorry, but to do a song medley or remix (or both), you need to be able to give it more than subtle changes and a few noises here and there. Also, I have good headphones. The bass should not be compressed.
Try changing:
The drums
The (whole)bass
The guitars
Don't Change:
The speed (unless it's fixed)
Panning (unless you get good with it and do it smoothly)
Try not to copy the song note for note. Even though you changed the speed, added some noise, and did some panning, it's still practically theirs unless you include very little of the actual song and add more of your own style into it. Don't be a rip off. I'll give it a better rating when it's changed.
--HG42