Try to download that not-Steam version:
https://zerok.itch.io/zero-kI have pretty big problems with running the game few weeks too, I was running it on a new laptop with AMD Ryzen processor. What finally helped was playing that version of the game that wasnt downloaded through Steam (and mind you, I tried disabling that Steam in-game interface, etc., nothing would help).
I asked that question under IGN Anaru, had to create a new account though, cause that previous account was linked to Steam.
