wrist fatigue; is there a solution

I have tried three times to play Farazel, which is a terrific game, and have had to quit about 1/3 to 1/2 of the way through, due to my right wrist giving out (I use my keyboard for all moves). Is there some other way to play the game, like a joystick - I am a novice at this kind of thing. I would love to be able to finish!!

I believe the iShock gamepad works. Also, you could try rearranging the keyboard, I use the arrows rather then the keypad. Ferazel is one of the few games that I could play forever without hurting my hands.