needs a new genre that separates it from everything ordinary and limited
independent games.
but if you do explicit stuff, it still ain't for minors, even if you do not aim to sell it in an adult video store. it is the same with violence. you can show a person getting killed and still have the thing be at 12+. but if you do that with bits flying around and gore everywhere, it will have a higher age rating that will change with location. to pick germany as an example, they might even legally ban your game, but will allow showing nudity in day time tv. while a nude pixel bosom on an us site like itch will get your game the nsfw rating.