Hello there! I don't think it's a system error as other people are able to play the game. The calls don't occur if you've chosen most wrong choices; have you tried following the guide that I've posted? It'll help you if you're stuck!
As for the save function, it's been mentioned on our page that it's missing in our current demo until we update it. Why is there no save? Because our programmer is using Unity, an engine that requires you to write code for everything, unlike Ren'py that already has a built-in system. So the save system takes a very long time to program. You can try waiting for the game to get updated so you can save or follow the guide!
Thank you for playing our game and appreciate your patience for our update ❤️