Okay the new version implement "Import" and "Export" buttons, and if the site blocks the "Save" button, it will display a popup where you can copy the URL.
https://haroldo-ok.itch.io/tiny-rpg-studio-sms/devlog/1571031/v0120-implement-im...
BTW: even after those fixes, your specific link (https://andredarcie.github.io/tiny-rpg-studio/#vy.oyXQAB_4CAgYACAgICAgICAgICAgIC...) seems to be failing on the importer; I'll take a look at this specific bug later on.