TBH, the speed controls and collisions with other racers both feel a little bit off. Your bike accelerates/decelerates so rapidly that there's really no in-between full-throttle speed and a dead stop. That might not be much of a problem (most of us are going to drive at full throttle anyway) except that for inexplicable reasons your bike is much faster than the other racers in front of you, AND there's a relatively short draw-in distance for those racers you're about to pass, AND you crash immediately if you bump wheels, although the other racer continues on unscathed. I assume those were all deliberate choices to make sure you're encountering "obstacles" at a predictable rate, but the net effect just saps the fun factor for me. Part of the problem is that this just doesn't work well with the small screen; the original arcade games didn't feel this bad because they offered better resolution to spot the upcoming racers and more horizontal room on the track to avoid them.
I'm not upset about paying $2 for this, but I think it would be a far more addictive game if your bike simply wobbled (requiring quick reflexes to stay on the track), lost speed, and/or took "damage" (perhaps only crashing after three or four collisions) after a collision, instead of crashing every single time. I think that would better compensate for the limitations of the GBC screen resolution.