Research monster girls and boys to further develop your career! · By AstroKaen
How much more content do you get for purchasing vs the free?
https://itch.io/t/3380785/paid-vs-free-versions
Currently you get the last sex scene with the latest released Kin that isn't in the free version.
As of next update the paid version will only have access to the new beta, and the free version won't get a beta demo until later.