I play version 2.0 on both the Windows or Android. I want to save the progress. And I like your animations and model very much :)
This is weird behavior because we have tested the game carefully on the web (2 browsers, Chrome and Edge), Windows exe and Android devices (a real physical Samsung and LDPlayer emulator), and the game automatically saves without any problem. Sorry for the inconvenience, we tested the game again while writing this and it still works, like many other renpy games, we hope that your devices don’t have some automations that auto-remove renpy’s saves.