Not sure if this is still monitored, but it'd be good to have a "ROM" or "original hardware" tag that indicates that the game actually runs on a retro system, rather than just adopting its general aesthetic.
There are individual tags for several retro platforms.
And they don’t indicate that the game with the “PS1” tag, for instance, actually runs on a PS1. Hence my post.
Some of them do, but ultimately creators decide how to tag their games.
Which is why it would be nice if there was a tag they could choose to indicate that yes, their game does in fact work on original hardware.