Cool idea here, but I think you can take it a lot further! To create musical interest you need contrast, an easy way for you to add more musical interest to this piece is by playing around with instrumentation. Maybe the piece can start the way it does, but as it goes on more instruments could be introduced. Anything to add more variety will help you to hold your listeners attention.

Bit thin. your arps hitting peaks....hear the pops? clean them up. I would try using a rhodes piano change the whole tone. it's nice and has potential.

Nice to hear something calm for once too :)