I remember reading a little blurb about this game in one of EGM's features on Japanese titles that were slated for (or had a shot at) stateside release. Usually, the bits they printed were broad, generic overviews with a positive slant, but in the Genocide one, they actually bothered to rip on the game. I still wanted it, though, as it looked pretty cool in screenshots. Obviously, it never made it over here, and I'd read nothing but negative reviews for it over the years, but I was still excited when I finally acquired it. I had hopes that it would join the ranks of Legion, Energy, and other such efforts that possess virtues in my eyes despite the fact that the masses deplore them.
And that mistake pretty much sums up Genocide on the whole: nice ideas, very shitty execution. The game plays incredibly quickly; your enemies in certain spots are so fast that they can gang up on your clunky mecha and annihilate it within seconds. You have to devise "plans" in order to survive these cheap stretches, and even when you know what you have to do, you'll likely suffer many deaths or take massive amounts of damage before you finally make it through.