I coulnd't understand how the aiming works, really
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hi, it isn't a normal bullet. Whenever you use the left and right arrows, a timestep occurs (as you saw). What the bullet does is shoot a specific tile across all timesteps.
This means that you don't need enemies to align. all you have to do is get all the enemies to be on a specific tile at some point in time. Then, when you shoot the bullet, all enemies that ever step on that tile will be killed.
Think of it as if you are choosing a death tile. Whatever touches that tile at whatever timestep will be killed. And whatever they do in the future doesn't matter, because they are already dead. Hope this helps.