i really wanted to play this game, but i can't deal with paypal sadly.
if you will ever make the guest payment available, please share that info widely. :P
on a different note, is someone trying to copy your game here?
You can get it on Steam: https://store.steampowered.com/app/1964820/Sprout_Valley/
Also they just posted demo, so it is fine, it is not full game they posted