No, I think the Djembe fits in perfectly! It's a great choice to carry the rhythm and the consistent use of it helps sit it in the mix a little easier, I think. Really enjoyed your tracks, I hope that you get plenty of more comments!
That's fair, I think Portable Ops isn't very popular as it's a PSP title, but it is very similar to MGS3 if you're familiar with that one! Very pleasant surprise when listening to it. :)