Hi, I'm really glad you like the project so much ^^! We've kept Paypal open as a way to help Kickstarter supporters who have had troubles with their cards being declined even though they pledged to the project, it's a backup option for them.
Since the KS is over we generally encourage people to check out our Patreon now instead (https://www.patreon.com/gbpatch). But you're welcome to send us an email about your situation if backing through Paypal is your only option (Email: gb.patch.games at gmail.com). The Paypal link will be closed near the start of the next week, though.
Thanks again for the interest!