Lately I have discovered Ziriax
on Amiga. This is one of the finest horizontal scrolling shmups I have played on this machine. -What a pleasant surprise.
If I had to choose the most playable shmup it would be Discovery's Hybris
The only 'disc-only' POD
release I remember is the one that came on a CU Amiga Coverdisc
in September 1992.