I paid $50 and then $20 twice on Patreon. But I have no way to access the beta.
Did you fill in a Google form before? I sent a link to Google form for the Patreon backers some months ago, asking for reward address and credit etc. Do you remember filling that in? Anyway, I think it's best to contact me via email for support: meyaoigames@gmail.com as I don't often check itch comments.