Patreon is a company that provides a platform and service for many creators to receive financial support for their work.
The link (on the first page, next to Ancho's name) is to a page that lists "tiers", levels of support for the creator that can offer a variety of other benefits (early access to the game, Patron-only posts, special art, polls and more).
It's a way for people to finance their work without trying to get picked up at a big company and possibly giving away control of their creations.