Saw many positive review so i dl it and ㅅㅂ I don't know why this game have high ratings. The boss levels are so hard, enemies passes through right away, you can't win on the first try and it doesn't even have fast forward option. The summons also are a scam, it also so hard to obtain the green balls but when you summon a duplicate, nothing happens, not worth the effort i put to every level.