Hello! I'm glad you love the game!
Every month there is a new version of the game where we add more graphic content and more story, so every month you would buy the previous version with the additional material.
The public versions right now are two months behind (almost three). The version posted here yesterday was posted on Patreon and Gumroad on April 30th. So if you decide to buy a version you'd get at least two months worth of content (pics and story).
Have a nice day!