I loved Tsukigakirei for the all the reasons you liked it. Spoilers for the ending,there's a part of me that wishes that the story just ends before the credits. I was happy for them that it worked out, but I think it would have been better for them to cherish that first love for what it was, grow up, and move on.
I agree with this too. Nice as it was to see, relationships don't need to last forever to have meaning. Whenever a high school romance story ends with an epic declaration of eternal love, it amuses me to imagine them drifting apart and breaking up in university, lol