Just caught up to this manga, and I liked it a lot. Goldy Lake did drag a bit, but the ending parts were hype. Emma is a fantastic lead character. I was worried at the start when she seemed to rely on Norman and Ray to do all the thinking, but she's grown a lot. This is going to be lost on most of you, but I'm reminded a lot of the My Little Pony fanfic Nine Days Down, where Twilight is trapped in Tartarus. Both Twilight and Emma are trapped in a twisted and dangerous land, desperately seeking out hope and somehow finding it, and trying to give her enemies at least a chance to become friends, but fighting back when they are turned down. The supporting characters are good too. They perhaps aren't using as many of the 60 or so characters as they could be, but as of the latest chapters, I don't think there are any that are being left out of the action that shouldn't be.
I know people were expecting more characters to die over the course of the story, but I much prefer significant character deaths being saved for actual important moments, rather than being spread out everywhere until you just don't care. The first arc handled this perfectly, Norman not dying aside, and I was good with no one dying during the search for the base. I thought it was a stretch that the Goldy Lake arc had zero human casualties during the fights, but the recent chapters have made up for that.
There are two structural issues I have with the series: it absolutely adores flashbacks and jumping ahead then flashing back to show how they got there, using both more than it should; and I feel parts of the story would have been better handled if they didn't cut to show the perspective of the antagonists. Let the audience learn things at the same time as the protagonists. Related to the first, chapters seem to recap the previous one much more than any manga I've read before, which I suppose is fine for a weekly release, but it's annoying when reading all in a row.
I read this right after reading Dr. Stone. While I enjoyed both, possibly enjoying Dr. Stone more, this is the series I'm left thinking about much more, I'm looking forward to the anime version of more, and I really want that anime to be good and succeed.