Pretty funky weird stuff going on here but it worksfor me. Atonal music without a central key is kind of hard to write because our ears are used certain chords that are predictable. This piece though keeps you guessing and I like it. I like that you started and ended with the strings, That rounded things out and gave it a sense of structure so it's not really a "midi-mangle". so there!
At this time I feel with pleasure that your composing verve is very strong. Many works and all of a great level. I listen and how much I appreciate it.