Wow, this is a really good use of Una Corda. It conveys the emotion of your composition in such an elegant manner. I believe I stated this about another piece of yours, but I think it's apt to repeat it again here: the harshness of the higher register isn't very pleasing, but it still works imo because it denies full satisfaction to the listener, which enhances the piece's emotional depth. Despite the relative simplicity, you still managed to retain the emotional side of your compositional style :D This is certainly easier to follow than your usual pieces, though that's not necessary better.
I really enjoyed it!