Top scrolling, side scrolling, shoot-em-ups. Everyone's played them (Raiden being the best example). What are your favourites?
I personally love the Gradius, Darius and R-Type series. But would definitely have to give special mentions to Recca (NES) (never officially released but absolutely amazing), Phalnax (SNES), IKARUGA (DC) and Mars Matrix (ARC)
Warning Forever: fight against a boss that literally evolves against your playing style. it's a pretty good time killer, though it gets quite hard later on.
mailmerge: thanks for the link I had incidentally stumbled across that just last night, ... i actually like the shooters solitude system 4 on that same site ALOT =)