Listened to this in my headphones. My first concern is the first 1:20 or so is probably too close to the source material, it might be enough to have the mix rejected. The next bit is a nice changeup, but some of the transitions felt a bit too abrupt to me (particularly the ones at 1:35 and 1:46, it felt like there wasn't anything in the preceding section that set either of these changes up, if that makes sense - basically, I felt like the flow was lost at both of these points).
Other than that, I have to agree with the previous two posters that the sound samples were a bit low-fi. They give the song a bit of a flat feeling. I think changing the samples would give the song a nice bit of depth.
I don't know that I have much of a problem with the drums, unlike the first two. To me, they have a very similar quality to the drums from the original song, which ties them together more effectively.