I like the idea of the story in theory and how it could have turned into a one-of-a-kind gem. Unfortunately the mangaka just hasn't gained enough expertise to properly execute it and bring out its full potential.
There's a large number of transition cuts in space and time in the manga that frankly don't make a lot of sense to me, a result of poor story-telling skill in this form of medium, and the reading experience naturally loses a steady rhythm and flow to it. There's been more than one instance where I have to go back a few pages to make assumptions and fill up the holes I stumble on during my read.
Meanwhile, the characters aren't exactly well developed, another setback from the ineffective use of flashbacks, so oftentimes their actions to move the plot forward don't quite agree with how they've been portrayed so far in the story. Other times they go completely bonkers and full on sociopath-mode out of no where and the audience can't catch up to the sudden shift in atmosphere even for a moment because right afterwards they're then slapped with comedic relief so blatant and off-putting that all that dramatic crap just panels ago can no longer be taken seriously anymore. Yes I'm talking about that last chapter in case I didn't make myself clear enough.
Also, whlie I do like the style of the artwork and its aesthetic, there's plenty of room for the mangaka to improve, particularly on her characters' facial expressions as well as on constructing spacial transition in order to maintain an adequate level of comprehension. The sketchy style is not terribly helpful either in clearing up confusion in such a story.
Overall I think there're both strengths and weaknesses that can be addressed here. I do hope that future attempts from the author will be rewarded with better finesse in execution in the final results.