Broken links. I was eager to see them, but I can't. Are you using imgur? If so, did you provide the direct link?

I know Carrotus was copied from The Lion King level "Hakuna Matata", Labrat was copied by Earthworm Jim levels "New Junk City" and "For Pete's Sake" and the mountains in Purple Maze (psych) were copied by Rayman's orchestra world.

How about the layer 8 images? More specifically the generator in Labrat, the nebula flows in Inferno and the giant critter in Damn. Were they also stolen from ... I mean ... inspired by other game pictures? And the fossils on Damn layer 6?