Disposable Hero is GREAT , but I still think Apidya is THE horizontal shmup on Amiga...
If you never tried it, try it now, it's great.
Project X gotta be one of the most overrated shmups ever. It's good, but not all that great as some people like to say.
Stardust and Super Stardust are great if you like Asteroids alike games. IMO, it pushed the asteroids theme to its limits, better than the activision remake .
Z-Out is not the same game as R-Type, although they are very similar
Oh, and the shmup I am doing for PC it's going to be the best shmup ever...
Hmm.. tomorrow I may post 1 or 2 screenshots of it, in the off-topic forum