I am afraid this series jumped the shark some volumes back. This time round it's more clouds of toxic gas, more fights to the death between 10 year olds, more of what's becoming mundane for our long-suffering heros. There is one shocker after they reach Paradise, which turns out to be an old amusement park, but even it I had been predicting since the first volume.
I thought Volume 10 finished the story, but no, there is more. One more volume that is going to have to be pretty spectacular to not to be an anti-climax.