I do not force anyone to pay anything; I am not the tax man. Patreon is the primary support site for this product and offers multiple subscription tiers with optional extras. The main game will always be the main game. Anything beyond that is additional work to create and not everyone has been interested in it; therefore it's available separately in higher tiers. This is explained on the game page information as stated previously. I'm sorry if you don't understand, but not everyone is entitled to free extra work.
EDIT: Additionally, if the problem you actually have is that you don't wish to pay extra on Patreon because you already purchased the game here, I'd be happy to work out a solution. But if you only wish to complain to me then I'm afraid there's nothing else I can do to help.