I liked the times where you felt ninja, but I think it's pretty stupid when you turn invisible and the guards stare at the spot where you are until you run out of energy. It makes no sense, a third and improved game is needed.
Hey, I tried to make a game, harder than you would think. For your first game, good job, keep working on games, click on stuff like Shootorials, and eventually you could make advanced sequels. Love the concept. DIE OSAMA!