Wow, I really love this bestiary! Congratulations!
I started a jam to create a collective OSR game, based on a small game/framework I released for free under CC0. If you'd like to collaborate, it would be great to have a version of this little bestiary for Old School Rules. What you wrote is really cool and would fit perfectly!
Here's the link to the jam, in case you'd like to participate:
https://itch.io/jam/the-old-school-rules-jam