It's interesting how this piece starts off so unassuming, yet you're instantly sucked in. I've heard other pieces try to do this with augmented harp music, but this one did a good job of setting up its rules up front. Subtly changing the "chord" of the piece by minutely focusing on an overtone or soprano note was also very clever, even though it all seemed to revolve around A minor for me.
From how you phrase your introduction, it doesn't seem to be intended for any auxiliary purpose, and if that's the case, I think the stark lack of real contrast needs to be addressed pretty heavily. The feel of "repeated time", as I call it, may not technically be in play here in terms of the notes played, but in terms of feel or atmosphere I think it absolutely does.
For a night, I think you did quite a good job. I would definitely take yourself up on your own offer and add to it; there's a lot of potential here.
Here's a little ambient/soundscape thing that I made last night. It's not really electronic, but I couldn't think of a better place to post it, so here it is! It's not much right now- just me messing around with some harp audio- but I may end up going back to it later on and adding more to make it a little more interesting. Let me know what you think!
I don't you have to think of a lot of them, that's kind of the beauty of it. Development exists for a reason... the idea can stay the same but how it evolves over time is really how people appreciate the music!