oh Man! you knwo I can never ignore these NES posts.
my favorite games that are "forgotten" today:
blaster master
rare - rc pro-am, cobra triangle, wizards + warriors (1st one) never tried snake rattle n roll but people are always bringing that one up too
crisis force (cool japanese top-down shooter by konami, some neat fx)
capcom - legendary wings, section z (old-ass shooters! fun stuff) and of course bionic commando, but i wouldn't say that was a sleeper..
amagon - weird + cute
milon's secret castle - looks dumb as hell but EXTREMELY fun after you get into it!
kickle cubicle - looks even dumber, but even more fun.
castelian (aka Tower Toppler on Atari XE) - weird but strangely compelling. got addicted to it a couple years ago.
rolling thunder (or the capcom rip-off code name:viper) looks great on the small screen! very stylish + sorta unqiue arcade action! it's still fun too.
mega man ripoffs - power blade, whomp 'em, krion conquest
shatterhand - nice gfx, action game
metal storm by Irem (rtype guys) - hard, stylish game with some nifty gimmicks. i haven't got too far into it but it's probably something I could spend a whole weekend with. very nice.
rampart - remember this old arcade game? i don't know about on GP32, but playing it with a friend on TV was tons of fun.
pro wrestling - old as hell. this was what we played b4 there was street fighter. it was a lot of fun and kinda silly.
enjoy!