Pretty well developed I guess... But there's no way to save yourself in many situations. The game just creates impossible situations. Having a health bar would help considering how many hits it takes to kill the other ninjas. Also, moving around would help tremendously. I don't know why you thought it was a good idea to leave the character in one place where literally everyone can come in from every angle and kill them.
A game is supposed to make you feel like you need to use your wit and prowess to beat it. This game is one of those games where you just have to throw a dice and see what happens. Games like that aren't fun. They're just cheap and lazy to make.