While I have no idea about anything you're saying lol and I think it looks great, there is something that irks me about your comparison.
You're using a YouTube video screen. If you could use one of these for a comparison, it would be much better since they are official screenshots.
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Those trees/bushes.. i don't know if it's meant to be really water paintish but this honestly look like somoene took the lasso, filled a shape with green, then painted in 5 secondes some orange on it. Then he copied that on the whole level as a background.
The cream mountain is one of the ugliest thing i've ever seen in a videogame. A clueless shape with a texture applied to it. And why are the coins that contrasted and almost not discernible ? Actualyl i begin to think they applied some kind of bloom with ultra contrast on top of their screens for whatever reasons...
The crystals (is that crystals ?) are heavily blurred/median filttered or i don't know why from something with no details it seems. Too contrasted, with a creamy puky overlighted area.. This is on top of a similar green poo with a 2D texture on top of it as a "material".
The coins omg.. we can see the cutout, the badly erased edge of them, like if they actually took something somewhere and quickly paste it as game graphics.
The yellow bridge, if you look at it well, seems to have some rest of pixel or something liek that. It's clearly filtered to hide something, and doesn't look the same render as the rest..
I cannot physically determine the shape of Yoshi in that shot. Talk about visual ergonomics in 2D platformer nowadays. In the first level gif you can also see a yellow flower on top of a yellow background, almost invisible. Nice.
Oh wait i didn't see that fiiiine green to orange to brown shade in the thing at the bottom
Wow that screen i don't know where to start...
Just look at the tree for christ sake.. Someting heavily blurred it seems.. The grass has not the same style as the rest, as it has a line that makes it stand out on top of everything liek it has nothing to do there.
Oh and in that other gif, the way this same cloud pop up 3 times in a row hyper quick in the background.. really ? It's like it's not a professional job.
Actually, the more i think about it, the more it seems Nintendo just showed us a demo project..