Took me a while to review because I wanted to explicitly set time for it. I got endings 4, 5, 6, 3, and, of course, 1 :)
I consider writing to fall under art and as such it gets a 5 from me. And the gameplay of visual novels is more based on how the player interacts with the "software" to "play" it. There's nothing too crazy or unique about the choices, but there are a lot of choices and there are enough to always effectively reflect what the player might want to say through Yuki.
My only gripe with the game is that this doesn't really connect with the theme of Spring and the limitation is inherent to the medium of VN's so it doesn't do anything ""out of the box"" besides complete the loop in a seamless way vs. the player pressing "try again!"
This is a beautiful game. Considering all of this was made by you (besides all the lovely assets you credited!) it just makes this game so impressive to me. The music and the cut scenes especially stuck out to me. The music, idek how else to put it into words, is just... SO pretty. You wanted this game to be somber and emotional and you were able to communicate that very effectively through the visuals and music. This is not a "novice" piece of work. You've created art.
I want to specifically point out that the composition of the artworks were surprisingly excellent in the cutscenes.
SPOILER WALL DO NOT READ UNTIL YOU PLAY thanks!
The writing isn't ground-breaking and that's okay! I can also there there's not "full" confidence in the English. Although I haven't done much writing myself (yet š) and there will be culture differences (so my points might be invalid)... I'm gonna say a bunch of things anyway and you can ignore me if u wanna: I think my problems with the writing are summarized by when Itsuki says "What, do you still think about that? Just forget it. It's too late". That's not a very nuanced or even in-character response. He comes across as dismissive of her and all I was thinking was "huh why would he say it like that". There's no crazy stakes stressing him out. Now, if he was straight up angry at her for being outside (maybe he was exhausted from searching and it was frustrating him), that changes the tone and emotional weight entirely and makes the scene make far more sense, personally. But otherwise, he clearly supports Kiyomi and is just looking out for her, like in those flashbacks and based on what he said his reasons were (no point in trying when the world is ending--again, not a super nuanced way to think), and I can only imagine after finding her that he'd be happy with the first thing he'd being "I'm so glad I found you!" and not "Ugh, finally, I found you" like she was some sort of problem and not literally his family >_>
Okay I realized I could've said this in a far shorter way: To me it's contrived and/or two-dimensional. I felt that way a few times throughout the story with Kiyomi and Itsuki. Let me know if you agree or not (hey u could message me on discord!)
Now with all that said, I still rated the art (aka the writing) at a 5/5 because I cannot stress enough HOW AMAZING this VN is! And in 14 days! And with gorgeous music! I just wanted the above critiques to let you see my perspective as a vegetarian-poutine-eating Canadian who consumes media sometimes :^)
I'd love to see what you work on next!