Hello, there!
Aww, that's really sweet of you!! 🥰 I'm happy that you liked the demo so much that it inspired you to draw more and create a game of your own!! That's really endearing to hear (seriously, it warms my heart so much!!) and I wish you nothing but the best in that; you got this!! ❤️
As for your question, Ko-Fi actually has an option to pay by card! That's how some people have been donating on Ko-Fi and/or buying Where Winter Crows Go via Ko-Fi too whenever they didn't have a PayPal due to region or other reasons.
I really appreciate a whole lot that you want to donate but, please, if it's not possible, don't worry about it! The good intention already means a whole lot 🥰