I've just had a second listen and like it better. I actually really like the general melody and the notes of the piano. The rest of the music and sounds are just so soft and flowing and I think the piano becomes a bit block-ish about halfway through the song. Like it could use some damper pedal or something. The piano at the beginning, before this, I really like though. Because as you said, it's simple, but really pretty.
I didn't mean to say outrightly that I didn't like it, well done because it is really nice!
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