wii remote configuration & usb game pad

[orochideep]

i know this might be stupid but i really want to play "bikini zombie slayers" using my generic usb game pad,i tried to configure it from wii remote configuration(nunchuk extension selected and tried to configure it)but problem is it dose not works properly,
i cant hit enemies in the game but other actions like jumping,moving works fine.please someone help me to configure it properly .