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As far as I can tell, Stan Lee is credited as the creator of the Marvel universe, and he’s still alive. Your second point is very vague, but Oddworld as a series isn’t nearly as old as Marvel and thus hasn’t yet needed to change as much to stay relevant.
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Marvel has a lot of writers and will continue after Stan Lee's death. Marvel universe is supposed to be set in our world (for example, Spiderman isn't in the sixties anymore) unlike Oddworld.