Refreshing.
I have no problem with its development. It is slow, yes, but that doesn't mean there isn't progress.
Mostly Hana to Yume and Lala's comics don't have an aggressive romantic feels in their story line. It's different with many mangas from Dessert, Cheese, Betsucomi, and others which is basically about love. I warn you to learn the concepts from each magazine before you regret reading it. <- you really have to.
Romance here is the main dish but not too much in the spotlight. They usually take stories from daily activities. I don't rule out the possibility that the relationship process was too restrained and stalled though. But this is on the same boat as Takane and Hana. They play with the plot.
I don't say this manga is flawless. Bluntly speaking, I actually feel anxious because the male lead is too gay. (I'm sorry for feeling this way, but I'm not a phobia because of it. In fact, I have friends like that once in the middle school). That's just, it doesn't give a special feeling that makes it an exception. It's more like "even though he is like that, he's good a guy and I love him." - cliche.
Anyway, I still love it for the way it is. You have to enjoy this manga from the cuteness.