Remake Game Watch
Mine would be Crazy Taxi for the PS5
I love that game but never played original but played it on the PS3
A modder tried to do it once, really impressive but he was never going to be able to finish it:
In that case, I want a Marvel Ultimate Alliance remake.
There are two games I would remake, Deus Ex (2000) and Pokemon Mystery Dungeon explorers of the sky. EOTS would get new mechanics with an open world, rather than being based all on dungeons (similar to what they doing with FF7)