This is really great. It's written well, mixed well, has a bunch of areas of interest so it doesn't get boring despite the simple progression. Tiny creative decisions that last for just a moment and aren't repeated or made a huge deal out of, like that Db major -> Db minor (I think?) change, are what make this really special.
What are those little crackles on the edge of the sound field? They work really nicely, but I'm curious about them. Also, I'm listening to this on my crappy TV and it still sounds great, which means you did a fine job with the production. Great stuff! :)