You want upscale Nintendo games? Buy a Nintendo console. I'm guessing that's their message. It worked for Pokémon, so why not Mario?
For an app on my phone it's better than I thought it would be. I ended up buying it after getting everything in the first three levels.
I think the NSMB art style works here but for 2D Mario on Switch (if they do it) they need to change it up. I was done with that series since I got bored with the Wii version.
So how about that Super Nintendo World huh?