I started to play this, so far I like the aesthetics and the gimmick, although I haven't played much of the more recent Super Mario games.
To sustain the platforms you use tile 1F0 it seems, that's cool, I don't always see this use.
I lost some Marios already, I'll try again tomorrow.
Also grey palette looks a bit bland, maybe some more elements of contrast would help the overall aesthetics.
So far so good.
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