This trick requires two controllers. To enable Debug Mode while playing, stop moving and press B on Controller Two, then move him around with Controller One.
For invincibility, hold Y on Controller Two. Pink will remain invincible as long as you hold Y.
To move in Super Slow Motion, hold R on Controller Two while moving.
To exit Debug Mode, press B again.
While playing, press START and SELECT simultaneously to warp to a new level.