Awesome arrangement, lots of very cool small bends and key changes. The main feeling i got, is all the transitions that you put expecting to go somewhere I though you would, I really thought at some point you would just go full drum and bass but you never did. It is repetitive, yes at some point we feel it but also for a video game lets say an exploration map or something, that would work marvelously. Very well mixed. I think you should add a layer of drum and bass somewhere, that would give some intensity and change of pace, I just feel it ! Great job ! Also awesome job working with MIDI in Reaper, I could never get used to the workflow.