Are you using the itch version and does in say v2020.11.17i in the top left corner? That's the latest version and works for me
I am using the Itch version, although I don't know if I have what you have on the top left corner, all I know is that last week I downloaded the latest version and it worked for a while, then it said I need to update and yet Itch isn't allowing me to update, it just says "Launch", sorry this was so long
Oh, that's weird, it should be working. There isn't a new update yet. You can try deleting it and downloading it again. If that doesn't work, you can try adding the game to Steam with the key on your download page. https://itch.io/my-purchases