For my part, I liked the character development. However, what bothered me at times was at some points it felt like the author stepped on the brake and set their relationship back a bit to get it going again. In some cases he skipped ahead a big chunk. But it didn't completely ruin the overall impression for me.
The side characters weren't annoying and moved the story forward. The artwork made them spread apart well, not like other manga. The artist really played with nature, drawing the mountains beautifully or even parts of Tokyo, where I even remembered walking through some parts when I was there a solid amount of years ago.
I think some things in the manga weren't worked out, or were forgotten, and it would be nice to resolve them, but everything can't be sun-drenched :-).
There are a few moments I would very much like to reread and will remember fondly. For me, definitely a piece I would recommend. The finale was in the spirit of the manga, so for me, satisfaction as well.
