Why not use the circlepad?
OSP Asteroids
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12Me21Created:
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My entry for the one screen program contest
Because, asteroids is designed to be controlled with 3 buttons. With a circle pad you'd have problems with accidentally moving forward instead of turning right, for example, because there's no boundary between pushing up and pushing right (also the code would be longer)
I made a version of asteroids too, and used the circle pad. I get the character rotation from the circle pad and move forward with X, works great.
this is me, replying to a 2 years old comment.