Hey I got this same kinda problem I just bought the game unzipped the folder as it told me to and went into the game it said the unity logo and then went black with a medieval gauntlet hand as my cursor then it told me it wasn't working I also tried the demo same thing and I tried the key for steam and it said it was invalid I'm not sure what to do please help.
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@Thelover38: the itch key is for itch version only, pls drop me an email to info@gayeti.com wif your system specs so I can check it out, also I'll send you a Steam key if needed :D