When I think about all the top 10 games lists, most of them are focused either on the cultural impact or on the story/sold units.

But does that really define gaming? When I think of gaming as a separate art form, it is defined mostly by emerging gameplay and the depth of functions used to provide your experience.

So, that would make the list look something like:
Factorio
X4: Foundations
.
.

So, what games can you think of, that provide a true deep gaming experience? And is there a good word, that would describe this kind of games? Because I really think, that I am mising the vocabulary to even talk about this topic.

@LukeAlmighty most are based on the cultural impact, yeah. I think that's fair, since a game with a large cultural impact is also probably a pretty damn good game. But it would be interesting to see a list of games that practically invented or defined entire genres. I suspect there would be some overlap there. Half Life would be on both lists for sure, for instance.