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I don't have a numpad... it would have been nice if you had provided an alternative layout like

QWE

ASD

ZXC

for people without a numpad, or you could make it so you can click/tap the squares.

Yes, I thought about notebook users, I'm going to add another Input schemes, or even the mouse, as suggested.

(+1)

Game updated. Now you can play using the Q W E A S D Z X C control scheme.