Let's be realistic, here.
"Due to substandard reviews, I've decided not to continue this series. That's what pilots are for."
"Average overall rating: 7.68/10.00"
Come on now, Golem.
Actually, the series ended here because, while the musical pilot was a good gimmick, there really wasn't much we could do with Thorax's basic concept. All the "giant, anthropomorphized bug" ideas we came up with were either A> done to death, or B> not funny.
The art was certainly a step up from Stonelife's earlier stuff, and I still think the pilot's pretty cool... but in the end, Thorax was more a sign of things to come than a successful project in its own right.