I love the ethereal sound of this.
I think for the mix, the thing that made my stuff sound clearer this jam was to split my two reverbs onto two tracks.
I always run my reverb on a send (from a delay plugin, so I can make it near/far in time), and then I also can control the wetness/dryness of the reverb by controlling the volume of the send.
I duplicated the receive track (reverb) and it duplicated all the sends in Reaper, which made it actually very easy (and every duplicated track also duplicates the send). This duplication lesson is something I learned this jam!
Great work, the sound design is excellent. :)