Len'en might have some memes, but my point is that they're entirely inside jokes, reliant on your pre-existing knowledge of the franchise. The videos I've mentioned managed to reach out to people outside of the fandom, which is why Touhou became the sweeping phenomenon that it was.
Nomico's Bad Apple!! managed to make it onto CNN, for example. Meanwhile, I'm fully aware of Len'en's existence and have played one of the games, but haven't heard so much as a peep from the community. That lack of free advertising will make any hopes of Len'en becoming a indie darling like it's parent series little more than wishful thinking.