The Zelda oracle games is the first thing that comes to mind. I think they did not get the attention they deserve when originally released. Remakes could spark interest for a new audience to experience them.
Of the older games I like most still play and look well enough to not need an upgrade. There might be a few games with great potential that was held back because the tech was not advanced enough. And there is probably a lot of games that could benefit from some quality of life improvements but I cannot think of much at the moment.







