Is it just more or the art just gets progressively sloppy...?

It’s true that it’s quite messy, sometimes, but it has been like this from the begging, and it’s not ugly ... personally, I love this art style, even if I’d like the authors to put more « serious » drawings...

me too !

I don’t think the art’s ugly. I especially love the chibi. Just thought it was more clean cut in the beginning. I felt like I was seeing more lines lately. But you’re right, the art’s been pretty consistent.