Congratulations on making your first complete VN! Stylish and cute visuals, interesting character design, and fun music. Tbh, the genre of the story is not quite my cup of tea, but every other aspect just makes it work. The premise is simple and I like the hopeful open-ended narrative.
There is more of the narrative, but alas, only so much can be told. You have an interesting setup, but I can understand why they're not explored further. Being a solo dev is hard.
I have a mixed feeling about the poetry segments. I think they were nice but for me, they felt a bit off. Maybe it's because they were blended in with the previous scenes (?) The use of the poetry segments with NVL mode was a deliberate choice, so I believe they should stand out more. Using different BGM on those parts would help.
And two little things: I was taken aback when the season changed from Winter to Spring, just like that. Perhaps a little visual cue like a filter would help to distinguish them. Also, there were like 3 dialogue lines (2 near the beginning, 1 near the end) that were too packed, overfilling the dialogue box.
Nevertheless, great job on your first try!