nice!
i think it is perfect the way it is. solo percussion is the way to go. you dont need to fill it up with a bunch of other crap to make it sound good. in my opinion by having more then one instrument is just another reason of trying to make up for something the first intrument couldnt handle. piano i beleieve us the only real instrument that can express so many emotions so easily and fluently. you did a great job on this piece keep up the good work!! try to make one a bit longer too! hope to hear more from you.