Hey! Quite a lot, actually
The free version is the Prologue - 2 NSFW scenes, a few enemies, and a couple of mini-games. It's a demo.
The paid version is the full Early Access build with Chapters 1 and 2 - that's 8+ NSFW scenes (animated comics with Kira, Princess, Gia, Clown Twins, Barbarian Girls, Marcelin, and more), 20+ enemy types, and regular content updates.