Hey, thank you for the support!
I am not sure I can refund purchases on itch.io, but feel free to pledge the remaining $10 on Patreon and messaging me about it. I will give you the $20 tier benefits and the full game key at release.
Done! My patreon is ImplodingMonkIf you need more information, please let me know if there's a direct email or message I can send it to you in.
Thank you sir! Can't wait to see the end result.