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Sure can - just delete the save file. They are located in:  \AppData\LocalLow\Studio Besus. Removing the whole Firewing folder should take care of it.

I had another look, and apparently the itch client had created a new "user?" in the Users folder. I needed to give permission to access the folder, so maybe that's why performing several system wide searches for terms such as "Besus" and "FireWing" and "FW64" didn't give any results.