Oct 24, 2021
This story is one that will be hit-miss with a lot of readers. Its packed with vibrant emotions that powerfully reflect someone afflicted by PTSD or a similar condition of heavy guilt over the consequences of a decision they made.
However, the very beginning doesn't help because the reader is utterly clueless on what's going on. How would a manga artist actually depict the scene of Cobalt falling/floating wandering in some vacuum where time and space just sit there? Personally, I resorted to Cobalt falling through portal hell as a compromise but I'm sure that isn't what you are going for
I can't see any logical reason to refer to Cobalt as an it during what I presume is his bad dream (in the abyss) because you come to call it him when he wakes up. Either having the dream reflect the horror of what happened that led to the death of Bismuth where he pries awake or if this is not a dream, but the start of something more, having what Cobalt is actually experiencing in the abyss would help me appreciate his experience and make greater sense of what is going on.
Alternatively, you could skip the abyss journey and start with just Cobalt waking up and that would be almost as effective at how his past is haunting him. That's how good the latter half of the story (and save the abyss if it plays a prominent role in this story for the next time he sleeps)