It matched rendering technique with the graphical design and general game movement/dynamics.
And when you do that, you always succeed. I mean, cave story's physics would've felt fucked up had the graphics been in the style of contra 4. The tiling and design would also have been (insert opposite of benefited, I don't speak this language

<) by another rendering style.
In the same way, Golden Sun with it's fantasy storybook pastelle aspirations would've benefited GREATLY from low-contrast CLEAR pixel-art.
O:
Sorry for cave-story ranting, I just finished the game with SECRET ENDING after hard level and 4-form final boss (: So I'm thinking about it all the time.
God damnit, that game has a gratifying ending. How come some indie games do it so well? O: