Heavy Unit
(the guy plays through a bunch of stages, but not all)
Here
Kaneko, 88'. Shooter where you can turn into a robot. I'm sure many people have played the Mega Drive or PCE ports. Pretty standard shooter but has some great enemy design, gotta love all the insane mini bosses and other unique enemies the game chucks at you.
Tatakae! Big Fighter
(complete run through but not a superplay, he continues)
Part 1
Part 2
Part 3
Nichibutsu, 89'. Another shooter where you can turn into a robot.... but I really, really liked the look of this one. Its been something I've had my eye on for years but still isn't emulated. The graphics are quite nice, and turning into a robot actually has strategic importance in that you can fire in all directions and can walk on the floor. Level design and boss design is great, and its quite thick with awesome 80's japanese sci fi atmosphere that I love
. Quite possibly the finest arcade title from the great Nichibutsu (though I'm sure some Galivan fans will disagree 
)
One particularly hilarious aspect though is the mission briefing chick having to literally tell you what kind of 'scrolling' certain stages will have, hahahha.
Vertexer
(attract mode and a short run)
Here
Taito, 93'. Special thanks to Zinger for linking this in an older thread of mine. F-Zero esque racing game that takes place on what appear to be courses in outer space. Looks insanely cool, some of the background effect such as seeing earth go past as you race around looks simply incredible.
