I actually liked the absolute lack of the usual focus on intimacy so many romance manga go for. Instead this manga could focus on all the emotional aspects, as well as the many non-romantic problems that life offers.
Plus, there isn't much time for intimacy, considering that like all but 4 chapters don't have a confirmed relationship. It'd be weird for Makoto and Ryuji to, like, kiss or something during that very brief period of time they're "going out".
The ending turning positive feels out of nowhere. Aoi's sudden lack of interest in Makoto is as weird as its vanishment just in time for the happy ending. I half expected it to end in the trio staying friends or even splitting up, each remaining unsatisfied, and tbh I'd be okay with that. Maybe it's just me, but the manga kinda held a great melancholic tone throughout. It felt very real, except for the few weird moments.