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(+1)

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

Okay, thank you!

(Edited 1 time)

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