[probably fine]

Diplo, you mention horror vacui in the first post, and I think you've written about this before in another thread about SMW. I definitely see this too in the vast, empty vertical spaces of certain stages and their endless backdrops. But I think that SMB and SMB2J, with their floors being composed of one tile repeated left and right identically to no end against plain blue or black backdrops, in fact impart (or maybe imply) horror vacui to a far greater extent. This gets reinforced by the weird bits, like overshooting a flagpole to find that the castle stretches on forever, or in the minus world's infinite loop.

SMW is probably my favourite 2D Mario, mostly for aesthetic and nostalgic reasons. But I do really like the slightly looser mechanical feel of moving Mario around than of that found in previous titles. And I really, really like how the spin jump has a shallower arc than the regular jump. As you get comfortable with the spin jump, it begins to feel like you can gently and quickly flick yourself over/between objects with just the minimum requisite clearance.
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Drawing & writing, mostly.