As the Maestro said himself: "I make one sound, and then I move on to the next". -Morton Feldman
I listened to his Piano and String Quartet, fascinating piece, especially toward the end.
Yes it is hard but thanks for your compliment! I get where your Minecraft idea comes from! Although this is hardly a melody, more like melodic fragments/cells. If someone is to play it I ask him or her to give every note it's own subtle quality and weight. A bit like you hear in performance of the works of Morton Feldman.
Lovely harmonies! It feels like you can use it very well for an accompaniment for another instrument or singer. Maybe write a full-formed melody on top?