Art (1)
There wasn't a lot of effort put into drawing Nezu and Hoshi, which I found really bothersome since they appear almost as often as Chihiro and Akira. Minor feet problems too, but other than those, I'd say that this is up to par with sensei's other works.
Plot (2)
The symbolism in the story is really touching, especially Hoshi's analogy of Chihiro's feelings to an oasis. Then, there's also that 'balloon game' which I found really heartbreaking because it would make you realize what a truly lonely person Chihiro is. It hits you right in the heart. The thing I hate though is that a drug prompted the love confession. Really, it's a poor plot driver.
Ending (1)
All questions answered and the not quite couple is heading in the right direction, thanks to Hoshi's intervention.
Note: This is more shounen ai than yaoi, actually.
Omamorishimasu, Dokomademo