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for a 10$ dollar a month how many more option do I get than just the demo at 20$ you seem to get the whole.

The $10 build has most things unlocked, lots of toys, multiple characters, scene saving, animation recording and more. The $20 version has some extras toys, a giantess scene, and other experimental features.  You can read more about the differences on Patreon: https://www.patreon.com/CaptainHardcore