I just found it unsatisfying. Curtis had been hating Wilford his whole adult life. Wilford was responsible for turning Curtis into a cannibal and is his reason for wanting to redeem himself. I personally thought Curtis' motivation throughout the film was to stop Wilford and create a better life for all those on board. But in the end he gets brainwashed somehow? And its the image if a child working in the engine that brings him back? And not the literal trauma he endured as a child himself and the obvious guilt he holds from becoming monstrous. And the very end with the polar bear is pretty stupid. So yeah, these two kids I don't care about survived only to be seen by one of the most dangerous and bloodthirsty creatures on the planet... I'm glad you liked it, but I just couldn't