A few complaints.
1. They cut off the descent! you'd expect them to show it, but nope. they were just on layer 4! I want to see them actually travel down to layer 5. same thing with layer 4! they cut off the descent!
2. the pacing is way too fast. it sometimes feels like he's trying to skip the adventure just to get to the important parts of the story.
I love this manga, but these are two huge issues. I'm still willing to give it a 10/10 if the story remains amazing.