I buy thinking that I could play on the Mac, but not worked, so can I have a return?
Viewing post in No, there is no version for macOS at this time.
It's clearly stated at the top of the page by itch.io itself that the game is only available on Linux and Windows. I don't think that itch.io will accept your refund request because of your stupidity you can still try and get a refund at: https://itch.io/docs/legal/terms#refunds