Hi there, I noticed that your games browser version still contains a "Quit" button, which causes the game to freeze because it's no longer inside the application loop. The common practice for Android and browser games is to remove quit-buttons and just trust the user will close the application them self.
I'm not a Godot user, but it seems that you can use "OS.get_name()" to detect what version you are exporting, so you can keep the same code for all versions, but include conditional code based off what operating system the function returns.