Gaplus - Namco - port of arcade game (unofficial?)
Metal Force - Chime
Rude Breaker - Compile - on DiscStation vol. 9
Steam Hearts - Giga - ero-shooter with later console ports to PC-Engine & Saturn with reduced adult content
Doujinsoft:
Burning Dragon - Wiz - Raiden-like shooter
Carax 92 - Bio 100%
E.S.P - A-Inn
Garudius'95 - CO2-Pro - Unofficial Gradius game
Hell Ogre - Zigo Watt
Kotsujin - CO2-Pro - A high quality vertical shooter; I believe there is a X68000 version as well
Markadia - Bio 100%
Net Guardian - Moguraya Soft
NyaHax '93 - Bio 100%
Owl-Zoo - Bio 100%
Stardust Chaser - Bio 100%
Super Depth - Bio 100%
Super Depth 2 Finalty - Bio 100%
Touhou Reiiden - Highly Responsive to Prayers - ZUN - 1st in Touhou series, not really a shooter but an Arkanoid-like game
Touhou Fuumaroku - the Story of Eastern Wonderland - ZUN - 2nd in Touhou series
Touhou Yumejikuu - Phantasmagoria of Dim.Dream - ZUN - 3rd in Touhou series, similar gameplay to Twinkle Star Sprites
Touhou Gensoukyou - Lotus Land Story - ZUN - 4th Touhou game
Touhou Kaikidan - Mystic Square - ZUN - 5th Touhou game, last game in series for NEC PC-98xx series
Weapons Free - ABA - Polygonal vertical shooter with multiple, selectable viewpoints; I'm sure most people here are familiar with the maker
Are the old Touhou games worth tracking down? I'm kinda curious how they are, since all the Windows ones are great. From what I hear the windows ones are considerably more detailed, however.
if you can find them, GET THEM, those ggames are AWESOME ... it has some kinda primitive graphics, but they are fun as hell, and worth playin, i specially like Touhou 04 and Touhou 05 ...