Thank you very much. I did not knew that there is a localStorage. I always saved data with Cookies or in a Database but i cant do this because i cant use backend languages on itch.io.
Although you can't use back-end languages on itch.io, you can use a front-end language (such as Javascript) to connect to an API (run by a back-end language on a server) and achieve the same functionality as you would with a back-end language right in the game.
