Really cool, I just found Z + X confusing controls, why that choice ?
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Oh you make a good point. Originally it was left/right mouse click. Then one of my friends said that laptops like macbook doesn't have right click button, so I changed like that. It's just two keys that you can easily be pressed with left hand (without moving your right hand off the mouse).
But I admit that it is not a very common choice. Is there any good alternative you can think of?