Worst, most unfair, poorly designed Metroid game I've ever played. Hits from bosses wipe out half your health, and somersault/screw attack still barely works (which has been a shocking move since the NES days). Boss battles feel like they were programmed by a 6 year old mashing a controller. Not worth the money, to be honest!
Edit: I've done the world a service and now there's one less copy of this idiotic "game" in existence.