To quote the game page:
- The free version of the game on this page is the full game but with some removed features and censored sex scenes. In the full version, you get access to additional features like uncensored art, the gallery (CG Gallery, Music Room, and Scene Viewer), and Nude Mode.
I'd love to release my entire game for free, of course, but I'm not in the financial position to do that unfortunately.
The censorship is there to encourage you to purchase the full version while still allowing you to experience the entire game's story for free. The only things you are missing out on by playing the free version are Nude Mode, the gallery, and some unpixellated genitals.
For a $5 game, I think that's fair.