What I was able to understand from your post: "Can I publish on other websites as well as itch even if I published on itch first?"
Yup! As far as I know you can do whatever you like with your own IP.
You've understood well, thank you for your answer. I had doubts about itch.io's rules, which I thought they hold publishing rights on my software, so that it does not allow publications on other sites.
