Games are way different segment. In a game you would like to impress person with non standard interface. In fact a game running on standard UI looks cheap and i

Games are way different segment. In a game you would like to impress person with non standard interface. In fact a game running on standard UI looks cheap and is a signal of design failure / low budget. While the applications are other way around. New customers do not want to spend more than a minute to get familized with the interface. Moreover, your custom UI interface will be competing with Apple/Google designer's budget.