Hello! Glad you enjoying the game. Just double checked that exit button works on demo, maybe you had a window out of focus or did not press accept. I understand your problem with paypal. Your best course of action will be to wait for Steam version sale. It is a hefty price, which is controlled by publisher. But I hope they will do big sale with new update and holidays season https://store.steampowered.com/app/1964820/Sprout_Valley/