Are you not able to buy itch games in Brazil? Can you please explain more? We didn't see any additional currency options, but if you have a guide we can follow, we would be happy to take a look!
Basically, itch.io doesn’t support international payments — I don’t know why they still don’t have that. It ends up hurting people who like the game but can’t buy it because the currency is different for us. Just so you know, your game costs $9.99 USD, but we don’t have the option to change the currency. If you could find a site that supports all currencies, I’d definitely buy it :)