Thank you for your reply.
I have sent two emails to support@itch.io 15 hours ago, but did not receive a response.

Thank you for your reply.
I would like to explain that I have already sent two emails to Itch.io Support (support@itch.io) about three days ago, however, I am sorry that I have not received any response until now.
I have read in some community posts that "Itch.io may only allow refunds within 7 days of purchase". I am not sure whether this is accurate, but I am quite concerned about the refund eligibility due to the relatively large amount I paid.
I hope you understand my concern and sincerely appreciate your assistance.
Best regards
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The key for customer support reference: [deleted]
I have sent two e-mails, and the Ticket IDs are : 279793, 279789.

Thank you very much for your help.
I would like to explain that it has now been 6 days since I first sent emails Itch Support (support@itch.io) regarding my refund request. Yet, I have not received any response or update so far.
I'm not sure if there is a strict “7-day refund window” policy, but I’m concerned that I may miss the chance to receive a refund due to the delay.
Could you please let me know approximately when I can expect the refund to be processed?
Thank you again for your time and understanding.
Best regards.
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The key for customer support reference: [deleted]
I have sent two e-mails, and the Ticket IDs are : 279793, 279789.