I just named some shmups without and you are very right that some of them are not very good.
Soul Force is probably the best shmup of all time on C64.
I purchased all games from Sarah. Nautron was the first reason I came back to C64. I think that game is better than Zeta Wing.
If there is no music just put on a CD, mp3 through a mixer. Then at least you have sfx :P
Soul Force is very nice, but I think I actually prefer Zeta Wing for some reason.
Neutron was good, has a bit of a Warhawk feel. Have you tried Kobo 64? It would make a PERFECT game for score attack competitions (plus you can select music or sound effects in the options ; ) ).
CD audio is not the same as chip generated tunes.... plus if the CD was any good I would want to turn off the sound effects so they didn't spoil it. :)
