I don't really see the whole "bad art" argument (if it's about the shading on Kiyose's hair, that's on my part since I waifu'd it for easier typesetting).
I mean yeah the art is pretty rigid but it's still nice enough for it to be enjoyable, personally for example I'd take this over Mira's art style. Just comes down to personal preference.
I think the art's fine. Not the best i've seen, but not terrible, like from someone who's still learning. I really liked this story though. It was cute.