According to Wikipedia (I'm currently committing the biggest crime of academic writing), this defines "Readability:"
Readability is the ease with which a reader can understand a written text.
In natural language, the readability of text depends on its
content (the complexity of its vocabulary and syntax)
and its presentation (such as typographic aspects like font size, line height, and line length).
As we cannot interfere much about how our text is displayed because Tapas takes care the most of it, we have full control of the content aspect. You can check your readability level for various sites, for example here. You can also use Grammarly, ProWritingAid, and even HemingwayApp.
There is also another standard of scoring readability called Lexile Framework for Reading. The score is 300 minimum (simple) to 2000 maximum (complex). You can check your 250 words snippet for Lexile score here
I have seen many writing resources saying that higher readability and lower reading level will ease readers into enjoying your novel; thus allowing it to be enjoyed by a wider range of audience. Even for adult demography, the reading level of your novel ideally should not exceed 8th grade level.
Novels with higher reading levels and lower readability have the potential of alienating certain reader groups or even not appealing to the mass who prefer something easier. Although for some folks who prefer more literary-artistic and intellectually challenging novels, they might prefer to read something like that. Some authors also do not want to "dumb-down" their own novels to stay true to their vision.
So, What is your expected readability and reading level of your novel? Does it match with your result? Are you satisfied with it? Do you think it is important
I'm honestly feeling conflicted about it. I feel relieved to know that my novel readability is high and it does not exceed 8th grade level. Yet, the reading level is 5th grade level and I don't know if it's okay to be that low for stories that are not meant for children. As I googled "5th grade reading level books" most of them are children book, plus my lower range lexile score is even lower than Twilight which everybody trash on. I start to think if I should make my writing more complex (although, how and should I?).