There are two actions: freezing ninjas (left) and throwing shurikens (right). You freeze ninjas in a specific position to make the shuriken bounce and reach the Shogun. Freezing correctly is the whole point Thanks for trying it!
Yes I am aware that there are two actions, the bug was that right-click was *freezing* the ninjas, not throwing shurikens
Oh sorry, now I see Yeah, ninjas have a clic event no matter which button is. But it does not affect the mechanic much.