I will say that I think Shadowdark hits in that area where it can be familiar to people for different reasons. Folks who have played a lot of DCC may see and feel the DCC in it.Maybe it's the English major in me, but what the author says is in the mix and isn't doesn't mean it's obvious to outside observers.
Douglas Adams credited Paul Simon's "One Trick Pony" album, which he apparently listened to on endless repeat while writing, I believe, The Restaurant at the End of the Universe, but it'd be a real trick to read through the book and say "ah ha, here's the influence of a post-Garfunkel Paul Simon."
I've seen OSE folks call it similar to OSE and some even wondering why they would switch seeing that is so close. I can kinda see what they mean.
I've seen 5e folks, in a single exchange, talk about two opposing things they liked and disliked. I kept thinking it can't be both!
I do worry a bit that the sample had too many voids and when people see the whole thing it'll fall out of that sweet spot for them. I suspect I'm wrong, that'll it just be more of it, but I do tend to worry.