I tried to download this game many times but each time I was confronted with a 403 error. This is due, I think, to my too slow connection and the protection system of ITCH.IO (to avoid sharing the links to other people than the buyer).

How can I access this game I VERY want to try?

You might have better luck using the Itch client instead.

I didn't know there was a client. I'm quite new here... I'm ashamed. So thank you.