For me, the most important factor in making a casual mobile game enjoyable is the gameplay. It has to be fun and engaging, without too much complexity. Five Nights at Freddy’s nails this with its simple yet intense mechanics—you don’t need a tutorial to get started, but the strategy keeps you hooked. If you’re interested in trying a game that combines ease of play with real tension, you can check out FNAF on https://sites.google.com/view/fnafunblocked/five-nights-at-freddys-7 . It’s a great balance of simple controls and exciting gameplay.