Talk about such a solid follow-up to the last volume! For what it's worth, I feel like this is still not a bad place for the story to have been set aside, but I still wish there was more than what we got.
Volume 4 of Zombie Powder is a very nice wind-down after the fast-paced adrenaline rush that was volume 3. Unfortunately, it's here that the story ends. I don't recall off the top of my head the reasons behind why Kubo never continued with the story, and back in the day when I first read this mini-series, it broke my heart to learn that these four volumes were all we were ever going to get. It still felt like there was a lot of world to explore, unanswered questions about all the characters we followed and the ones that get introduced in this final volume, and despite the hopeful upswing, the story still feels like it's ending on a cliffhanger.
Re-reading it now, while my original sentiments about that still hold, I think the way things ended and how they ended where they did were the best kind of send-off Kubo could have written with what little he was allowed to do. There's no true resolution, in a way, but since I'm older now I'm more easily able to appreciate that a lot of that is left up to reader interpretation. I suppose if I still want more, I'll try to find fanfic on the internet. (Or if I'm feeling bold enough, I might write some myself.) But I'm less bothered by the lack of resolution now and I owe it to Zombie Powder to state as much. This series is still solid for all that it got canceled, and I still adore it to pieces. This time, it's going to stay in my collection for a very long time to come.
[Once again, I did not re-read the short stories at the end of this volume. They were thrown in for padding, and as with volume 3, I doubt I'll ever re-read the shorts. I just don't have the patience or energy to read those and write up reviews for them at this point in time.]