There's a way to undo it in the same dungeon you got it.
Mado
Creator of
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You can try JAST: https://jastusa.com/games/mdwk001/ero-dungeons
They have some additional payment options.
That happens with Windows Defender sometimes, it will flag files it hasn't seen before until enough people use it to trust it.
The message you got was probably wacatac.H!ml, which is a heuristic (H) by the AI (machine learning, ml) of windows defender. If you've downloaded the file from here, it's safe. If you want to be 200% sure, upload it to virustotal.
Patreon.com/EroDungeons
subscribe to the warrior tier for the $10 version, the noble tier for the $18 version
If Patreon also doesn't accept your card, consider using JAST: https://jastusa.com/games/mdwk001/ero-dungeons
https://itch.io/t/215710/how-do-sales-show-up-on-credit-card-statement
It doesn't show the game's name.