This is hands-down the best collection of OSR-compatible creatures I've yet read. After reading through twice, I'm definitely ready to inflict monstrous suffering upon my group's characters! My only complaint is the plethora of female-only sexualized creatures. I don't have a problem with that, except that it would be nice for more of a gender balance there. I hope that any future follow-ups might add more gender variety in its perversions.
[5 of 5 Stars!]