Beautiful, very touching and emotional in a good way!
I agree with what @imagegod said above about the portamento and I want to add a few small tips to enchance it maybe a bit more. The overal reverb amience sounds a bit disconnnected, it could benefit from a general reverb that glues it all together. Now the different layers sound a bit different reverb wise.
Also maybe pan the instruments a bit (cello maybe a bit to the right, keep the harp in the middle and the choir a tiny bit to the right) to enhance the spectrum.
Great work Muluku! Enjoyed it.