Hello.
The Good:
-Okay, you took a "meh" song that's a minute and 40 seconds long and stretched it to being over 7 minutes long and GOOD. That's pretty impressive.
-It was a good idea to use such a simple song as your basis, because it let you do some really crazy stuff over the top.
-Your transitions are AWESOME, even if they're a bit long.
-The vocal samples are very well-done and fit the concept well.
The Not-So-Good:
-The first 2 minutes create an amazing ambiance, not sure where the vocal samples come from. Unfortunately, it goes on a little bit too long IMO.
-The buildup from 2:00 to 2:58 is a bit overly long. Could have used a bit of a faster build.
-Some mixing problems on the right side at about 4 minutes in.
-The section from about 4:29 to 5:19 doesn't appear to have much of anything to do with the original song. This is a relatively minor issue, but if you're going to be soloing over pretty much the rest of it due to the simple basis, it should probably stay closer to that. same goes for the string instruments from about 5:42-6:09.
-The ending is a tad dull in comparison to the rest, though it does fit.
Overall: Score of 10/10. This was pretty amazing overall in composition, and even with the minor problems of overly long sections and somewhat unrelated sections, there is a ton of substance here. Great work!