I downloaded a game called?

Dr Lynch Grave Secrets the game is awesome i downloaded it from Iwin games i've never had any other game problem with iwin but this game was playing well its an unlimited trial game with adds inbetween I played till level 4 and then wen the 20 seconds add finished the game became blank (black) no picture only the background music i can hear wat could be the problem i unistalled the game twice but still faced the same problem. Please HELP