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I don't have any sort of definitive argument or anything, since it's more just how it felt to me and I'm not sure that'd transfer over well? But regardless, Sunshine honestly felt like Mario 64 + FLUDD and better graphics whereas Galaxy felt like Mario in Space. If I had to guess, it may have been how Sunshine's hub+open worlds setup was closer to 64 than Galaxy's more numerous but linear worlds, or maybe it was just the window dressing and music and the like, or probably it was that I disliked the changes the FLUDD added enough that I was rejecting them, and so without that was left only with the similar material.

Note that all this doesn't mean I dislike Sunshine or anything. I just rate it below 64 and the Galaxies, personally.