I have downloaded the file, and extracted it all as a zip, but I can't play the game, I am on PC
It could be a faulty download, the servers on Itch can be hit or miss.
I'd retry by downloading from our Patreon. It requires a Patreon account, but free to make if you don't have one already. Here's the latest free version:
Would also recommend checking your anti-virus settings (if active) as it can flag the game as a false threat.