Add a guide like every other motion bowling game uses. Kinect bowling uses the triangles on the floor to line up your shot which I think would work for this game. You might have to make the bowling ball smaller or translucent to make this work. As it is now it can be frustrating hitting a single pin or difficult shots because you don’t know where your ball will go. Make this a toggle so if you want a more dynamic game you can turn it off because this will make it easier.