John Van Wagoner
Well, to answer the question literally - yes, you could have as many saved games as the number of devices you own on which you can install apps. The save files are stored locally as far as I know, so a new save file on one device should not overwrite a save file on the other device. "it is not the same thing as having the possibility to save two times during one scenario"...no, i understand that...just that it would be possible (if anyone had a reason to) to have 2 diff games 'saved'...
However, it is not the same thing as having the possibility to save two times during one scenario.
Since the app randomizes the layout and sometimes even parts of the story, you'd probably find that the scenarios plays out differently on each device, if you had the same scenario playing on both of them.