I'm shocked nobody has commented about this, but expecting us to willingly type in our Patreon credentials to some random itch.io app UI is insane to me. I'm sure you probably mean well, but you could very easily steal our credentials.
You need to have some kind of secure web redirect or embedded web view for patreon's website.
To any potential players reading this, please do not blindly give your patreon credentials to this guy. And to the game creator, I sincerely hope you shut this game down immediately until you've made this secure.