I freaking called it with the transformation.
As a note, Sometime explained on Twitter that it got a good reader response but the direction she wanted to take it didn't mesh with the editors and magazine. So rather than change her work she decided to cut it there.
So it's less "it was unlucky" and more "Sometime had artistic integrity"
What, that sucks ass! Of all things, that's what killed it?
In terms of pure action, it might very well be that the author/artist wouldn't be able to hack it outside of 4koma, which is a shame but there still should've been plenty to show. That they stuck all the body horror stuff in a mere 4 chapters is already amazing, and they developed plenty of concurrent plots well.
With how she fought, this could've gone the direction of both girls getting in the suit at the same time, controlling different body parts.