Strange... I run it through the Itch app and it works fine (also Windows). I think I might know what is causing that problem, and I will do some messing around to see if I can cause it and then fix it. In the meantime, let me know if it works fine when download through the website :)
Glad you got it to work! By chance, does the path to your Itch app files contain a space? That is the only thing that immediately stands out as a possibility. That was a problem at one point in development, but it should have been taken care of, as I cannot get it to happen again.