Sunrise into Day is wonderfully chill. The use of the bird calls here really sets the tone and helps create some aural intrigue in-between the initial piano chords. The melodies are nice and tranquil, taking their time to plod from one note to the next. It personally gives me sunny day kind of vibes; the outside is inviting you to explore it, but there's no pressure or rush to get out and experience it.
Moonrise into Night follows in a similar vein, this time soloing out the piano in the beginning. I like how you've relied more on the upper register of playing to really sell the quiet calm that comes with nightfall. Even when the chords come in, they aren't too deep to delve into the lower register. Nice and contemplative progression, growing a little more open as the track goes on.
I think both of these function as great sound beds for capturing their respective vibes. Some more supporting instrumentation such as some strings or the likes might help flesh each of them out a little more, but as a whole they set out and do what they need to do to establish the vibe. Good work!