If you're looking for something cute and amusing, and not very deep, then this might be right up your alley.
In of its genre and target demographic, it's quite fair to say this is one is on the better half side of things. It isn't bad, and is very spot-on in its light-hearted humour.
I suppose it all boils down to personal expectation of what you expected to read when the plot basically involves what it says on the tin.
On the comments about the height difference being absurd, it's part of the point of the story? Not necessarily as a point of struggle, but more as a something used for fluff and humour.
If you're thinking about the contortion involved for the couple in this series to have a realistic kiss or whatever eye roll, then, really, I'd love to see the oppai girls, so very much common shounen, have actual back pains once and a while, not to mention the pain of having DD-cups, that they should already struggle to hold up, getting squished when they try to kiss their significant other. Talk about contortion pains.
Also, and I'm saying this as a girl (whose reading selection is widely varied and not restricted to shoujo, which very much includes all kinds of porn), is it weird that I started reading this mostly to amuse myself in reading something that very much looked like Non-H loli? Ok, I'll it, it's pretty weird.
No, she's not a prepubescent girl, and, Yes, there's such a thing called Size-Difference Kink. Albeit, it's used here in a non-H way.
I found it cute and something enjoyable to read when one is in the mood for fluff. It doesn't have a lot of surprises, and, yes, it's typical shoujo, but at least it doesn't have random rage-inducing tropes just to keep things exciting/angsty.
Give it a shot, it just might surprise you. Or you'll hate it enough to come back here and give it a 1, a common reaction to typical shoujo. Heh.