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Have asked itch.io about the ways to do it. Will let you know again once I've received an answer. 

Okay, thank you!

(1 edit)

Itch.io has responded, and "topping up" previous purchase isn't something that is currently supported. Currently, the only way to do it would be to ask for a refund, and then re-purchase with a higher value. If you want to do this, send me an e-mail to meyaoigames@gmail.com with your itch.io account e-mail address (I'll relay to itch.io regarding the refund).

Thanks so much for all your help! Just re-purchased at the Toru demo tier ($48.99) and I'm loving it. This will definitely tide me over until the full game is out