Oh yeah, i love greed island. It being an arc certainly keeps the novelty of the other world’s mechanics from getting old.
To make it work as a full series you gotta have a lot more substance though, because at some point that novelty will inevitably run out. And now instead of “exciting new world where everything is different”, it’s just a regular world we’re already used to. At that point you gotta have an actual compelling story to keep it going.
Blasphemy!