Wow, this is really nice! It looks like you used the Bitsy to the fullest. I appreciate the tone/mood, but also the subtle working with the flat layout and how it progresses through the relationship (in minimalistic graphics) and - of course! - the colors. Very nice. Some bitsy games tend to get a lot generic it seems to me, but this is not. And the interlude with cat and sunset/sunrise is great. I like the dissonance between continuity of the game screens and time discontinuity of the fictional time.
Very nice work. Reflection of the stars in the bowl of milk for a cat. I'm gonna think about that next time I'll go to sleep!