I'm pretty sure the Patreon page mentions it's on Hiatus - so no payments are actually billed until it's status changes back to 'active'...
EDIT: I'm not actually sure about that, seems to have changed a couple times? Ask one of the 144 People still in it if they're being billed I guess?
Looked it up in his most recent post, it's clearly intended to be paused anyway:
"And as always, I'm not going to take any Patreon payments until 0.4 is out (I'll temporarily suspend my Patreon at the end of each month until then)."
Joined on the 1-dollar tier out of sheer curiosity - I'll know for sure if it's got payments paused by the end of the month ;P
PS: That last line was utterly unnecessary. Itch is a free community, *most* games here - including this one - are available for free and anyone who feels so inclined can post their creations on it. The quality of the devs - and their work - is in no way guaranteed and should be judged on individual basis.