Nice little melody
I like! It was a little too repetitive for my taste BUT I really liked that ambient atmosphere you created. This song was very soothing and calming. I really enjoyed my listen.
My recommendation is layering. I think this song could be developed further by adding more layers- perhaps some bass synth, and/or some strings, and/or some counter melody synths could really spice things up. But I do realize that you were going for simple so maybe that would take away from that. Just a thought.
One more thing- I need help with my latest submission, if you have time... could you please shoot me a review? It would be very helpful! :)