Keep the same core gameplay concepts, reboot the roster, reboot the items, reboot the story, add in any elements that jump to mind. (n4g.com)
But it doesn't count more than a solid core gameplay concept well executed. (indiegames.com)
Boshi [$ 0.99] is one of those games that focuses on delivering a simple but unique core gameplay concept, with little room for frills or extras. (toucharcade.com)