... What?
Considering the majority of Retro styles games have incredible simplistic gameplay mechanics, there's no way that retro games as a whole "prioritise core gameplay over graphics"
Go to steam, set the price filter as low it can go and just wade through the nearly endless sea of "Retro" content.
The majority of those games don't even capture the pixel art aesthetics they claim to be replicating.
"It's 8-bit" but using impossible colours and sprites that even back in the 80's would have been criticized.
8-Bit gaming can look gorgeous, with fluid animations and cinematic presentation.
Just look at Prince of Persia on the BBC Micro, and it still has better gameplay than most indie games running on astronomically more powerful hardware
As of course we have the Master systems offerings, A console from 1985 offering better gameplay & sprite work than 80% of modern "retro games"
Good retro games are hard to come by, most could be considered lazy and hide behind simplistic graphics as a shield from criticism rather than embrace the self imposed limitations as a challenge to be overcome.