As an avid hunter for all things unsolved, I'm familiar with the Voynich manuscript of indeterminate provenance. I think this is a really fun way to bring it to life and make sense of the thing (following the hypothesis that it is some sort of medieval recipe book).
The gameplay books are a bit buggy, I was able to open them a few times but then never again and I think they might be instrumental to gameplay because it had a guess option in it. I did craft some stuff and got to see a bunch of the (well-curated) creatures spawn and muck about.
As others have mentioned, the gameplay itself is a bit convoluted (which I think works to a degree because IT IS a mysterious cipher text) but there probably needs to a little bit of visual telegraphing to really ground the gameplay whilst keeping a lot of the mystery.